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1

Digitale Medien

Structure of a second form of 1,2;2,3-di-μ-hydrido-μ3-tetracarbonylferrio-cyclo-tris(tricarbonylruthenium)(3Ru–Ru), H2FeRu3(CO)13 (1984)

Hsu, L. Y. ; Bhattacharyya, A. A. ; Shore, S. G.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 722-725

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005485

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2

Digitale Medien

Structures of mercury dichloride–dipotassium dichromate (1/1), HgCl2.K2Cr2O7, and mercury dichloride–diammonium dichromate (1/1), HgCl2.(NH4)2Cr2O7 (1984)

Averbuch-Pouchot, M. T. ; El-Horr, N. ; Guitel, J. C.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 725-728

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005497

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3

Digitale Medien

Structure du triphosphate de cuivre(II) et de trisodium dodécahydraté, CuNa3P3O10.12H2O (1984)

Jouini, O. ; Dabbabi, M. ; Averbuch-Pouchot, M. T. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 728-730

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005503

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4

Digitale Medien

Two-layer structure of tricalcium germanate, Ca3−x[GeO4](O1−2x,F2x) with X∝0.275 (1984)

Nishi, F. ; Takéuchi, Y.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 730-733

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005515

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5

Digitale Medien

Structure of calcium thymidine 5'-phosphate dihydrate, Ca2+.C10H13N2O8P2−.2H2O (1984)

Sato, T.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 736-738

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005539

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6

Digitale Medien

Location and anisotropic refinement of deuterium atoms in deuterium sodium silicate–deuterium oxide (1/8) Na2D2SiO4.8D2O by neutron diffraction; hydrogen bonding at 173 K (1984)

Schmid, R. L. ; Felsche, J. ; McIntyre, G. J.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 733-736

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005527

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7

Digitale Medien

Structure of calcium 2'-deoxyadenosine 5'-phosphate pentahydrate, Ca2+.C10H12N5O6P2−.5H2O (1984)

Sato, T.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 738-740

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005540

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8

Digitale Medien

Dipotassium salt of 3-hydroxy-4-mercapto-2-thioxo-3-cyclobuten-1-one dihydrate (potassium 1,3-dithiosquarate dihydrate), K2[C4O2S2].2H2O, at 140 K (1984)

Mattes, R. ; Johann, G.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 740-742

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005552

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9

Digitale Medien

Structures of azidobis(dimethylglyoximato)(triphenylphosphine)cobalt(III), C26H29CoN7O4P, and [4,5-bis(methoxycarbonyl)-1,2,3-triazolato]bis(dimethylglyoximato)(triphenylphosphine)cobalt(III), C32H35CoN7O8P (1984)

Nelson, J. H. ; Takach, N. E. ; Bresciani-Pahor, N. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 742-746

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005564

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10

Digitale Medien

Structure of trans-bis(dimethylphenylphosphine)bis(pyrazole)platinum, [Pt(C3H4N2)2{P(CH3)2(C6H5)}2] (1984)

Oliver, J. D. ; Mullica, D. F. ; Grossie, D. A. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 746-748

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005576

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11

Digitale Medien

Structure of (5,10,15,20-tetraphenyl-21H,23H-porphinato)platinum(II), C44H28N4Pt (1984)

Hazell, A. C.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 751-753

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S010827018400559X

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12

Digitale Medien

trans-Chloro(dimethylamine-N)bis[dimethylglyoximato-(1–)-N,N']cobalt(III), [CoCl(C4H7N2O2)2{NH(CH3)2}] (1984)

Lenstra, A. T. H. ; Geise, H. J. ; Tyrlik, S. K.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 749-751

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005588

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13

Digitale Medien

Structure of bis(tetraphenylphosphonium) (dichlorodithioferrato-S,S')disulphidooxomolybdate(2–) methyl cyanide solvate, [P(C6H5)4]2.[FeCl2{MoO(S2)}(S2)].C2H3N (1984)

Clegg, W. ; Garner, C. D. ; Fletcher, P. A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 754-756

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005606

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14

Digitale Medien

The structure of μ3-thio-μ3-tris(disulfido)-chlorato-cyclo-tris[(diethyl dioxodithiophosphato-S,S')molybdenum](3Mo–Mo), C12H30ClMo3O6P3S13 (1984)

Shang, M. Y. ; Huang, J. L. ; Lu, J. X. (C. S. )

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 759-761

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S010827018400562X

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15

Digitale Medien

The structure of bis(tetraethylammonium) bis(μ-acetato-O,O')-tri-μ-chloro-pentachloro-μ3-oxo-cyclo-trimolybdate(3Mo–Mo), 2C8H20N+.C4H6Cl8Mo3O52− (1984)

Shang, M. Y. ; Huang, J. L. ; Lu, J. X. (C. S. )

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 761-762

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005631

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16

Digitale Medien

Copper(I)–olefin complexes. Structure of 1-chloro-2-(1-2-η-cyclohexene)-μ-[hydrotri(1-pyrazolyl)borato-N:N',N'']-dicopper(I), C15H20BClCu2N6 (1984)

Thompson, J. S. ; Whitney, J. F.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 756-759

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005618

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17

Digitale Medien

Structure of diaquabis(4-methyl-N-8-quinolylbenzenesulphonamide-N,N')cobalt(II)–acetone (1/1), [Co(C16H13N2O2S)2(H2O)2].C3H6O (1984)

Castresana, J. M. ; Elizalde, M. P. ; Arrieta, J. M. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 763-765

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005643

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18

Digitale Medien

Bis(succinimido-N,N')argentate(I) de sodium pentahydraté, Na[Ag(C4H4NO2)2].5H2O (1984)

Khayata, W. ; Baylocq, D. ; Pellerin, F. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 765-767

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005655

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19

Digitale Medien

Structure of tetrakis(N-methylimidazole-N')copper(I) perchlorate, [Cu(C4H6N2)4][ClO4] (1984)

Clegg, W. ; Acott, S. R. ; Garner, C. D.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 768-769

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005667

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20

Digitale Medien

The ribbon structure of catena-{μ4-(dihydrogen mellitato)-bis[bis(oxamide oxime-N,N')nickel(II)]} tetrahydrate, [Ni2(C12H2O12)(C2H6N4O2)2].4H2O (1984)

Endres, H. ; Knieszner, A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 770-772

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005679

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21

Digitale Medien

Structure of bis(9-methylhypoxanthine)silver(I) nitrate dihydrate, [Ag(C6H6N4O)2](NO3).2H2O (1984)

Aoki, K. ; Saenger, W.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 772-775

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005680

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22

Digitale Medien

Structure of (1-methyluracilato)silver(I), [Ag(C5H5N2O2)] (1984)

Aoki, K. ; Saenger, W.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 775-778

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005692

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23

Digitale Medien

The structures of the lanthanide ethyl sulfate enneahydrates, M(C2H5SO4)3.9H2O [M = La–Lu (except Pm)], at 171 K (1984)

Gerkin, R. E. ; Reppart, W. J.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 781-786

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005710

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24

Digitale Medien

Structure of the copper(II) dichloride complex of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diacetatocopper(II) methanol solvate, [Cu(C16H28N2O8)].CuCl2.CH3OH (1984)

Gluzinski, P. ; Krajewski, J. W. ; Urbanczyk-Lipkowska, Z. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 778-781

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005709

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25

Digitale Medien

Structure of tricarbonylbis(triphenylphosphine)ruthenium(0)–tetrahydrofuran (2/1), [Ru(CO)3{P(C6H5)3}2].1/2C4H8O (1984)

Dahan, F. ; Sabo, S. ; Chaudret, B.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 786-788

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005722

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26

Digitale Medien

Tetramethylammonium diiodoargentate(I), [N(CH3)4][AgI2] (1984)

Peters, K. ; von Schnering, H. G. ; Ott, W. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 789-790

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005734

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27

Digitale Medien

The structure of 1,2;3,4-bis{μ-[bis(diphenylphosphino)methane]-P,P'}-1,2;2,4;4,1-tri-μ-carbonyl-1,2,3,3,4-pentacarbonyl-tetrahedro-tetrairidium(0), C58H44Ir4O8P4 (1984)

Harding, M. M. ; Nicholls, B. S. ; Smith, A. K.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 790-793

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005746

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28

Digitale Medien

trans-Dichloro(dimethyl sulfoxide)(isopropylamine)platinum(II), C5H15Cl2NOPtS (1984)

Melanson, R. ; Rochon, F. D.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 793-795

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005758

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29

Digitale Medien

Trinitrato-(O,O')(triethylene glycol)europium(III), Eu(NO3)3(C6H14O4) (1984)

Forsellini, E. ; Casellato, U. ; Tomat, G. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 795-797

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S010827018400576X

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Structures du tris(nitroso-1 éthanal oximato-N,O')ferrate(II) de tétraphénylphosphonium, [P(C6H5)4][Fe(C2H3N2O2)3], et du tris(nitroso-1 éthanal oximato-N,O')ferrate(II) de tétraphénylarsonium, [As(C6H5)4][Fe(C2H3N2O2)3]: deux exemples de dédoublement spontané des isomères optiques lors de la cristallisation (1984)

Gouzerh, P. ; Jeannin, Y. ; Miler-Srenger, E. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 797-801

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005771

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Structure of disodium 1,4-piperazinedicarbodithioate hexahydrate, 2Na+.C6H8N2S42−.6H2O (1984)

Legros, J. P. ; Troy, D. ; Galy, J.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 801-804

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005783

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Digold(III) strontium octaacetate dihydrate, Au2Sr(C2H3O2)8.2H2O (1984)

Jones, P. G.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 804-805

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005795

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The structure of two yellow tris(2,2'-bipyridine)iridium(III) complexes: bis(2,2'-bipyridine-N,N')(NH+-2,2'-bipyridinium-3-yl-N')iridium(III) trisperchlorate–water(1/1), [Ir(C10H8N2)3](ClO4)3.H2O, and tris(2,2'-bipyridine-N,N')iridium(III) trisperchlorate–water(1/2.33), [Ir(C10H8N2)3](ClO4)3.2.33H2O (1984)

Hazell, A. C. ; Hazell, R. G.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 806-811

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005801

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Structure of hexaaquairon(II) bis{tris[1,3-dimethyl-2,4,5,6(1H,3H)-pyrimidinetrone 5-oximato]ferrate(II)} dodecahydrate, [Fe(H2O)6]2+.2[Fe(C6H6N3O4)3]−.12H2O (1984)

Ruiz-Valero, C. ; Monge, A. ; Gutiérrez-Puebla, E. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 811-812

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005813

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Structure of 3,3'-(trimethylenediimino)bis(3-methyl-2-butanone oxime), C13H28N4O2 (1984)

Hussain, M. S. ; Mazhar-ul-Haque ; Ahmed, J.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 40 (1984), S. 813-816

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270184005825

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Energy calculations for the lattice dynamics of NH4IO3 (1974)

Salje, E.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 518-521

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The lattice dynamics of ammonium iodate have been studied experimentally and theoretically for centre-zone phonons. The frequencies of normal modes have been measured by Raman spectroscopy. The experimental results have been used to obtain the parameters of a simplified rigid-ion model. It is shown that the strongest bonds are the linear I-O and N-H covalent interactions, while the low-frequency external NH4-IO6 mode is mainly ionic in character. The effective ionic charge of the NH4 group is - 0.82 e.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001240

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The joint probability distribution applied to a weak sign relationship in non-centrosymmetric space groups (1974)

Giacovazzo, C.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 522-524

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The probability distribution of the phase Φ = 2φh - φh - k - φh + k is found in P1. It is shown that for strong |Eh|, |Eh + k|, |Eh - k,| and weak |Ek| structure factors, Φ is distributed around π.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001252

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A method of determining the distortion of coordination polyhedra (1974)

Dollase, W. A.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 513-517

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The distortion of an observed coordination polyhedron can be evaluated from a comparison of this polyhedron with the least-squares best-fit polyhedron with optimum location, orientation, size parameters and prescribed symmetry. A set of atoms at positions, x(1) .... x(n), may be fitted to the set y(1) .... y(n) by rearranging the matrix equations: y(i) = t + Rλ(i)x(i) (i = 1,n) and solving for the unknown parameters of the translation vector, t, the rotation matrix, R, and the (diagonal) dilation matrices, λ(i), which optimize the fit between the two sets. The elements of the (one or more) dilation matrices may be constrained to fix the fitted set to the desired symmetry. The solution is effected by means of a two-stage iterative least-squares technique employing the so-called 'small- angle' rotation matrix. The average distance between corresponding atoms of the two sets, which is a minimum at the point of optimum fit, provides a unique one-parameter characterization of the degree of distortion between the two configurations. The magnitudes of the operations needed to produce the best fit are also recoverable from the least-squares solution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001239

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The dynamical scattering amplitude of an imperfect crystal. III. A dynamical diffraction equation for topography in the spatial coordinate representation (1974)

Kuriyama, M. ; Early, J. G.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 525-535

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Based on a general dynamical theory of diffraction, an integral equation for dynamical diffraction in imperfect crystals is obtained in the spatial coordinate representation. This equation is derived for diffraction topography in the symmetrical Laue geometry from the basic dynamical equation of diffraction previously derived in the momentum representation. Discussion is presented on an interpretation of this integral equation beyond the given diffraction geometry. This equation can be considered as a basic equation for diffraction topography.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001264

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An application of the unitarity equation to the phase problem of electron scattering from crystals (1974)

Boyce, J. F. ; Roberts, S. A.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 543-548

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The unitarity equation is used to determine the phases of electron scattering amplitudes from crystals. A sufficient condition is derived for the phases to be determined up to a possible twofold ambiguity. Successful comparison has been made with a theoretical test case.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947400129X

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The use of X-ray anomalous scattering for the detection of small deviations from centrosymmetry (1974)

Srinivasan, R. ; Vijayalakshmi, B. K. ; Parthasarathy, S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 535-538

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A quantitative relation is obtained between Bijvoet differences and the deviations from centrosymmetry of a structure. An expression is derived for the root-mean-square value of Δ, where Δ = [I(H) - I({\bf {\bar H}})]/σN2,σN2 = \sum_{j = i}^{N} f2J, in terms of 〈|Δrj|〉 and k” where Δrj are the deviations in atomic coordinates from ideal centrosymmetry, and k” = Δf”/f'. Curves are given connecting r.m.s. Δ with 〈|ΔrJ|〉 for a two-dimensional hypothetical model. When 〈|Δrj|〉 is small the r.m.s. Δ is quite sensitive to 〈|Δrj|〉 with a moderate anomalous scatterer present in the structure. The behaviour of the Bijvoet ratio is also studied empirically.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001276

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X-ray studies on the effects of Ba2+ impurity in KCl (1974)

Braude, I. S. ; Rogozynskaya, L. M. ; Startsev, V. I.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 539-542

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Using the X-ray diffuse scattering technique, KCl crystals alloyed with 0.005 at.% barium were investigated. Possible distributions of Ba2+ impurities in the lattice of KCl, the formation of segregates in the form of additional planes parallel to the {100} and {130} planes of the matrix, are shown. On the basis of the analysis performed on the X-ray photographs the nature of distortions present in the alloyed lattice is ascertained. The influences of the impurities on the binding forces between matrix atoms in the (100) and (130) directions are shown.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001288

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Faceting the dodecahedron (1974)

Bridge, N. J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 548-552

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Rules are given for the construction of facetted polyhedra which ensure that the reciprocal figures are also polyhedra. The complete set of 22 facetted dodecahedra is enumerated, depicted and correlated with the stellations of the icosahedron.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001306

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Interpretation of the 10 Å rotation function of the satellite tobacco necrosis virus (1974)

Lentz, P. J. ; Strandberg, B.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 552-559

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The rotation function calculated with 10 Å three-dimensional data from monoclinic crystals of the satellite tobacco necrosis virus was fitted numerically to an icosahedral axis set. The r.m.s. angular deviation of the observed peak maxima from the calculated model axis set was 0.67° and the largest deviation was 1.4°. Thus, there is no significant deviation from icosahedral symmetry at 10 Å resolution. An investigation of the effects of the data inclusion limits and the radius of integration on the resolution of neighboring peaks in the rotation function showed that the best resolution was obtained by using only a thin shell of the highest-resolution data available and a radius of integration no larger than the estimated diameter of the virus protein subunit.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001318

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Secondary reflexions of neutrons diffracted by a single-crystal bar vibrating at high frequency (1974)

Mikula, P. ; Michalec, R. ; Cech, J. ; [weitere]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 560-564

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Diffraction of neutrons by a longitudinally vibrating quartz single-crystal bar was investigated for thicknesses of 3 and 13 mm. The 1st, 3rd and 5th harmonic frequencies were excited in the bar. The observed increase of the integrated intensity of diffracted neutrons as a function of the vibration amplitude of longitudinal vibrations of the quartz bar is compared with that calculated from an approximate theory considering the possibility of secondary reflexions of neutrons during their flight across the sample.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947400132X

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Crystal structure determination by simultaneous use of cosine invariant computation and the multisolution method (1974)

Busetta, B. ; Comberton, G.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 564-568

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: An algorithm is given for the rapid computation of the cosine invariants, cos (φ - H1 + φH2 + φH1 - H2), and the results are compared with the actual values for three structures. A weighting scheme is derived which enables this information to be incorporated directly into the multisolution tangent method of phase determination. Details are given of the determination of four unknown structures by this method.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001331

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Automatic absorption correction using intensity measurements from azimuthal scans (1974)

Flack, H. D.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 569-573

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A new method of making absorption corrections from azimuthal scans is described. The method is designed to work on an automatic four-circle diffractometer for crystals with high absorption, of arbitrary shape and having at least four general equivalent reflexions. The data are treated by a procedure which expands the transmission factor as a Fourier series in the diffractometer angles, The variation of transmission with 2θ is simulated by tabulated values for a sphere. The method has been tested by correcting. for absorption in a crystal of SmAu6 (μR = 5.9).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001343

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The effect of disorientation on the intensity distribution of non-crystalline fibres. I. Theory (1974)

Holmes, K. C. ; Leigh, J. B.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 635-638

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The intensity function in reciprocal space is derived for the case of non-crystalline fibres with a Gaussian distribution of orientations. An expression is found relating the observed intensity function with the weighted integral along a circle of the intensity derived from the molecular structure factor. From this result in the case where the layer-line width is very small a correction factor may be derived which, if applied to the observed intensity, yields the intensity which would be obtained from a perfectly orientated fibre. The general problem of correcting for disorientation can only be treated by a numerical deconvolution procedure.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001537

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The symmetry of the spin-density Patterson function (1974)

Litvin, D. B.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 785-791

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Generalized space groups are defined to describe the symmetry of a spin-density Patterson function due to the spin-group (generalized magnetic group) symmetry of a spin arrangement. The information on spin arrangements obtainable from the generalized space-group symmetry of a spin-density Patterson function is discussed. It is shown that one cannot infer from the symmetry of the spin-density Patterson function the characteristic spin-group symmetry of a spiral spin arrangement, and an alternate method of doing so is given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001872

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Correlative microdomain model for short-range ordered alloy structures. I. Diffraction theory (1974)

Hashimoto, S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 792-798

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A diffraction theory is developed for diffuse scattering from disordered binary alloys with short-range order. It is based on a model of ordered microdomains embedded in a disordered matrix and interference effects between the domains are considered. There is a possibility that the fine structures of diffuse scattering as observed in the cases of Cu3Au, CuAu and Cu3Pd alloys result from the introduction of interdomain correlations. From experimental diffuse intensity values one can calculate the statistical distribution of microdomains in antiphase with one another.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001884

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On the concept of reciprocal basis vectors (1974)

Knudsen, T.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 846-847

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Ewald's concept of reciprocal basis vectors can be defined in a more general way. It is suggested that the definition of these basis vectors should be presented within the framework of the matrix notation, and not lean so heavily on the concept of a skew product of vectors. The metric matrix, which bears significance in any vector space is the crucial matrix in such a definition.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001963

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Interstitial space in hardsphere clusters (1974)

Sickafus, E. N. ; Mackie, N. A.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 850-851

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The interstitial space in a cluster of spheres is examined to determine the largest sphere that can be placed in its voids. A method is given for obtaining the interstitial sphere belonging to a group of arbitrarily arranged spheres by examining tetrahedral configurations. Given the coordinates of the centers and the radii of the spheres of a tetrahedral group, the coordinates and radius of the tetrahedral interstitial sphere can be found. The method can be applied to interstices of any coordination number. It is applicable to sphere packings with or without crystallographic symmetry.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001999

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Technique for Berg–Barrett stereo topography (1974)

Tu, L. K. ; Vreeland, T.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 852-852

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A stereo pair of Berg-Barrett topographs of an (0001) surface of zinc is obtained with a single exposure. One topograph is the 0{\bar 1}13 reflection while the other is the 10{\bar 1}3 and an 84° stereo separation angle results. Errors due to dislocation displacements which might occur between two successive topographs are eliminated, and correction for geometric image distortions is not required.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002002

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On the standard deviation of a dihedral angle (1974)

Shmueli, U.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 848-849

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Expressions for derivatives of a dihedral angle with respect to positional parameters of the atoms involved are presented and their use with the propagation-of-error formula, in evaluating the standard deviation of a dihedral angle, is indicated. The expressions derived are valid in oblique and orthogonal frames of reference. The approach outlined provides a greater flexibility in accounting for atomic positional variances and covariances than other treatments of the dihedral angle so far proposed. Inclusion of covariances of symmetry-related atoms in the equations presented is indicated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001987

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Report of the Executive Committee for 1973 (1974)

International Union of Crystallography

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 857-871

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947400204X

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The distribution of atomic distances (1974)

Albertsson, J. ; Schultheiss, P. M.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 854-855

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The use of normal-probability-plot analysis to compare independently determined molecular geometries [De Camp, W. H. (1973). Acta Cryst. A29, 148-150] is justified by a calculation of the distribution of interatomic distances in a crystal structure under some simplifying conditions, which in most cases are at least approximately obeyed. The distribution is shown to be normal to a good approximation in spite of the non-linear transformation applied to the atomic coordinates in calculating the distances.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002026

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Notes and News (1974)

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 872-872

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002051

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On symmetric variations of fault energies (1974)

Crocker, E. G. ; Bristowe, P. D.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 855-856

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The distribution of interatomic distances across unrelaxed stacking faults is shown to be independent of the sense of the fault vector if the shear plane is perpendicular to an n-fold axis or if the shear direction is parallel to an n-fold axis. Hence the unrelaxed energies of such faults, calculated using pair potentials, are symmetric with respect to the sense of the shear.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002038

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Semiconductor physics by K. Seeger (1974)

Goodwin, D. W.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 872-872

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002063

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The solid-liquid interface by D. P. Woodruff (1974)

Glicksman, M. E.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 872-873

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002075

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Oxide semiconductors by Z. M. Jarzebski (1974)

Rhodes, R. G.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 873-873

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002087

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Fourier transforms of distributions and their inverses – a collection of tables by F. Oberhettinger (1974)

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 874-874

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002099

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Coherence and quantum optics – Proceedings of the Third Rochester Conference, June 1972 edited by L. Mandel and E. Wolf (1974)

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 874-874

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474002105

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A note on the probability distribution of phases in a non-centrosymmetric crystal with a degree of centrosymmetry (1974)

Parthasarathi, V. ; Parthasarathy, S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 574-576

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The probability distribution of the magnitude of the phase angles in a non-centrosymmetric crystal with a degree of centrosymmetry is worked out for a structure with similar atoms. Curves showing the probable fractional number of reflexions for which the magnitude of the phase angles would deviate from the centrosymmetric values of 0 or π by any given amount α0 are also obtained for crystals with different degrees of centrosymmetry.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001355

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A contribution to the determination of a correct system of signs of structure factors for centrosymmetric crystals (1974)

Hašek, J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 576-579

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: To find a solution of the phase problem of centrosymmetric crystals, it is as a rule necessary to find among many possible solutions a correct system of signs of the structure factors. This paper describes the procedure used for finding a correct solution based on a comparison of the theoretical and empirical distribution functions of the positive signs of structure products.

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URL: http://dx.doi.org/10.1107/S0567739474001367

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A method for location of the peaks in step-scan measured Bragg reflexions (1974)

Lehmann, M. S. ; Larsen, F. K.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 580-584

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A method for location of the peak in a step-scan-measured Bragg reflexion profile is described. It leads to a ratio between the standard deviation of the intensity and the intensity, σ(I)/I, which is near minimum. The method is based on the observation that if σ(I)/I is calculated for all possible peak widths for a given profile then σ(I)/I is minimum near the true value of the peak width, and minimal σ(I)/I can thus be used as a criterion for correct location of the peak. The intensity determined this way is however in general slightly underestimated, and the bias as well as possible corrections are discussed. In addition a simple function resembling σ(I)/I, which has proved to be useful for practical applications, is given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001379

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67

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Phonon symmetries determined from space-group diagrams (1974)

Pawley, G. S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 585-596

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The representations of space groups describe the symmetry of crystal lattice vibrations. These representations are presented in a diagrammatic way easily understood by those familiar with International Tables for Crystallography. A few diagrams are considered in detail in an effort to bring out the salient points. The relevance of plane groups and Shubnikov groups is emphasized, though it is clear that these groups in themselves are not sufficient for a complete description of phonon symmetries. The diagrammatic description must be considered as complementary to the analytic approach, but unlike the latter it is not capable of a thorough description. A table is given for certain space groups which indicates to what extent the diagrams can be found useful, encompassing one-dimensional and a limited number of two-dimensional representations. Although higher dimensions involve too many problems and must be left to the analytic approach, the insight gained by drawing diagrams may prove beneficial.

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URL: http://dx.doi.org/10.1107/S0567739474001380

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Neutron diffraction measurement of diffuse scattering in VC0.75 (1974)

Sauvage, M. ; Parthé, E. ; Yelon, W. B.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 597-599

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The location of diffuse intensity originally observed in electron diffraction patterns of short-range-ordered VC0.75, has been confirmed by neutron diffraction experiments on a four-circle diffractometer. A new set of short-range order parameters has been calculated on the basis of these accurate intensity data and the agreement between experimental results and theoretical predictions for short-range-ordered compounds with NaCl related structure has been improved.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001392

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A determination of the absolute values and signs of the 111 and 222 structure factors of silicon (1974)

Ando, Y. ; Ichimiya, A. ; Uyeda, R.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 600-601

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The thickness fringes of a silicon wedge at the Bragg positions for 111 and 222, and at the symmetric position for hhh were observed with the electron microscope at 100 and 392 kV. The ratios of the measured fringe distances were analysed by the many-beam dynamical theory in electron diffraction assuming the theoretical values for the structure factors of orders higher than 333. As the result, the crystal structure factors are derived as F111 = 59.87 ± 0.46 and F222 = - 1.85 ± 0.85 at 293 °K.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001409

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70

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Treatment of negative indices in crystallographic fast Fourier transforms (1974)

Mallison, P. R. ; Teskey, F. N.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 601-602

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: An algorithm for fast Fourier transformation using sequentially organized backing storage is described; a simple modification has been made to an existing procedure, to allow the Fourier coefficients to have negative indices, without the need to introduce additional phase factors. A general purpose crystallographic FFT program has been written for a 16K IBM 1130 with three disks.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001410

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A comment on Prasad & Srivastava's paper, On the occurrence of Zhdanov numbers 1, 2 and 3 in the zigzag sequence of cadmium iodide polytypes (1974)

Agrawal, V. K.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 603-603

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: As a comment on the paper by Prasad & Srivastava [Acta Cryst. (1972). A28, 494-497] it is shown that the possibility of occurrence of CdI2 polytypes having Zhdanov numbers higher than 3 in zigzag sequence cannot be ruled out theoretically for their structure determination.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001422

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Commission on Crystallographic Apparatus (1974)

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 604-604

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001446

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73

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Refinement of merohedrally twinned crystals (1974)

Hawthorne, F. C.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 603-604

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A simple procedure is outlined whereby merohedrally twinned crystals may be refined with existing least-squares programs. It is applicable to crystals containing any number of twin individuals and can handle different twin laws simultaneously.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001434

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The dynamics of atoms in crystals by W. Cochran (1974)

Dolling, G.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 604-605

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001458

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Crystal structures – a working approach by H. D. Megaw (1974)

Nardelli, M.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 605-606

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001471

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76

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Computed electron micrographs and defect identification by A. K. Head, P. Humble, L. M. Clarebrough, A. J. Morton and C. T. Forwood (1974)

Steeds, J. W.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 605-605

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947400146X

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77

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Atomic diffusion in semiconductors edited by D. Shaw (1974)

Willoughby, A. F. W.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 606-606

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001483

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78

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Structure factor algebra in the probabilistic procedure for phase determination. I (1974)

Giacovazzo, C.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 626-630

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: It is possible to take the statistical weight of reflexions into account in the Σ1, Sayre and tangent formulae. A suitable new use of the normalized structure factors is proposed in these procedures for phase determination; new generalized formulae are derived in a form suitable for automatic computer calculation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001513

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79

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Structure factor algebra in the probabilistic procedure for phase determination. II (1974)

Giacovazzo, C.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 631-634

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Some distribution functions deduced in the previous paper [Giacovazzo, C. (1974). Acta Cryst. A30, 626-630] are further developed. A new form of the Cochran relation (Eh) = EkEh - k/N1/2 is suggested, which is valid in all space groups. A new generalized tangent formula is pointed out which takes the statistical weights of the reflexions into account, as well as their contingent centrosymmetric nature.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001525

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80

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Systematic intensity-dependent differences in structure factors derived from the Single Crystal Intensity Measurement Project of the International Union of Crystallography (1974)

Mackenzie, J. K.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 607-616

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: 14 of the 17 sets of structure factor data for D( + )-tartaric acid collected on the initiative of the Commission on Crystallographic Apparatus of the IUCr have been compared without making explicit assumptions concerning either the nature of the interaction of X-rays with a crystal or of the statistical distributions of the measurement errors. It is shown that the greater part of the differences between the 14 sets of structure factors derived from the different single crystals depends systematically on the intensity and wavelength in a manner strongly suggesting extinction as the cause. These differences are apparent even for medium intensities and the largest structure factors may be underestimated by as much as a factor of two. When the major systematic intensity-dependent differences are removed the statistics of the residuals show an excess of both large and small values as compared with a normal (Gaussian) distribution. The effects of different weighting schemes on various R values are considered and it is shown that while the ordinary R value is fairly robust, weighted R values with weights that correspond to assuming σ(F) ∝ F or σ(F) = const, grossly overemphasize respectively either the low or the high intensities.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001495

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81

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Etude experiméntale des susceptibilités diamagnétiques moléculaires. I. Méthode générale (1974)

Van den Bossche, G. ; Sobry, R.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 616-625

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Lonsdale and Krishnan used a method for relating crystal and molecular susceptibilities in which they calculated the molecular tensor from the principal crystal susceptibilities assuming that the directions of the principal axes of the molecular tensor are known. Their method is only applicable when the molecular symmetry permits. To avoid this inconvenience and to allow an interpretation of molecular anisotropies in terms of chemical groups, we assume that each molecule consists of a skeleton on which different substitutions are made. The molecular tensor is thus the sum of the different elementary tensors associated with the molecule and related to an orthogonal and common set of axes. Several molecules with common skeletons and substitutions were studied to obtain the different elementary tensors; the set of equations which relate elementary tensor components to crystal susceptibilities in the approximation of weak intermolecular interactions was solved by a least-squares method. Our method was applied to benzene, hexachlorobenzene and hexamethylbenzene separately at first and then all together. The results are given for the substitution of a hydrogen atom by a chlorine atom or a methyl on a benzene ring. Several possible applications of this method are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001501

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82

Digitale Medien

The effect of disorientation on the intensity distribution of non-crystalline fibres. II. Applications (1974)

Stubbs, G. J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 639-645

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Starting with the integral form of the correction factor derived in the previous paper [Holmes & Barrington-Leigh (1974). Acta Cryst. A30, 635-638], the explicit form of the function describing intensity in reciprocal space for slightly disoriented non-crystalline fibres is described, and simplifying approximations are made. Correction factors for real data are calculated, and the validity of the theory tested with data from tobacco mosaic virus gels. A correction factor is also given for crystalline fibres.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001549

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83

Digitale Medien

Probability distribution of Bijvoet differences when the group of normal scatterers is partly centrosymmetric (1974)

Parthasarathy, S. ; Parthasarathi, V.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 649-654

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Cumulative functions of the normalized Bijvoet differences x and Δ and their expectation values for a non-centrosymmetric crystal in which the group of normal scatterers is partly centrosymmetric are worked out for the cases when the number (P) of anomalous scatterers in the unit cell is one and many (MN and MC cases) respectively. The results are used to obtain the percentage of reflexions for which Δ ≥ 0.05. It is found that even when 50% of the normal scatterers form a single centrosymmetric group, the measurability of the Bijvoet difference is not affected significantly by the partial centrosymmetry of the group of normal scatterers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001562

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84

Digitale Medien

Morphologie et propriétés optiques des cristaux de lysozyme de poule de type quadratique et orthorhombique (1974)

Cervelle, B. ; Cesbron, F. ; Berthou, J. ; [weitere]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 645-648

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Large crystals of hen egg-white (HEW) lysozyme, both tetragonal and orthorhombic, have been studied with a goniometer and optical methods. As the crystals are particularly stable, some of their optical properties have been measured, mainly the refractive indices determined from reflectance measurements under a photometric microscope. Orthorhombic HEW lysozyme: crystals show the faces (010), (011) and (110). Refractive indices n[001] = ng = 1-562 to 1.547 (λ = 480-640 nm); n[100] = nm = l.560 to 1.544; n[010] = np = 1.550 to 1.532. Maximum birefringence 0.013 (λ) = 589 nm). Optic axial angle 2V =48 to 51°. Tetragonal HEW lysozyme: crystals formed by the association of a tetragonal {110} prism and a {101} tetragonal bipyramid. Refractive indices n[001] = nc and n[100] = no, with an aging phenomenon in these crystals, ne varying between 1-580 and 1.545, no between 1.575 and 1.538 (λ = 589 nm). Maximum birefringence 0.007. HEW lysozyme crystals are examples of good-quality protein crystals. Their refractive indices are surprisingly high for organic substances.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001550

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85

Digitale Medien

Debye–Waller coefficient of KCl by the powder neutron diffraction method (1974)

Beg, M. M. ; Aslam, J. ; Butt, N. M. ; [weitere]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 662-667

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The neutron diffraction pattern of powdered KCl has been measured using the triple-axis spectrometer both in the double-axis and the triple-axis modes. The thermal diffuse scattering (TDS) correction, which is very important in the double-axis pattern, is essentially eliminated in the triple-axis mode. Theoretical calculations are presented which give the relative TDS correction for the two cases by calculating the energy distribution of TDS. The Debye-Waller coefficient B using the triple-axis data is found to be (2.17 ± 0.16 Å2), which is in agreement with the TDS-corrected values of other workers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001586

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86

Digitale Medien

Coherent-scattering amplitude of 243Am and 244Cm (1974)

Mueller, M. H. ; Lander, G. H. ; Reddy, J. F.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 667-671

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Neutron diffraction experiments have been completed on 243AmO2 and 244Cm2O3. The coherent-scattering amplitude of 243Am, relative to a value of 0.58 × 10-12 for oxygen, is 0.76 (1) × 10-12 cm. The value for curium is ̃0.7 × 10-12 cm, which cannot be determined accurately in this experiment because both C-type (cubic, a = 11.0 Å) and A-type (hexagonal, isostructural with La2O3) Cm2O3 are present in the sample. Some of the difficulties in performing neutron diffraction experiments on these radioactive isotopes, which exhibit self-heating and spontaneous fission, are discussed briefly.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001598

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87

Digitale Medien

Neutron diffraction study of asymmetric anharmonic vibration of the copper atom in cuprous chloride (1974)

Sakata, M. ; Hoshino, S. ; Harada, J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 655-661

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Neutron diffraction measurements of CuCl with the zincblende structure were carried out at room temperature and the results examined on the basis of three possible structure models: (1) harmonic thermal vibration of atoms, (2) asymmetric anharmonic vibrations and (3) statistical disorder arrangement of the copper atom. It was found that the anharmonic model was the most plausible for the structure of CuCl. The final R value in the least-squares analysis was 0.037. The parameters in the effective one-atomic-potential fields for the zincblende structure Vj(r) = V0j + ½αj(u21 + u22 + u23) + βju1u2u3 + . . . were obtained as αCu = 0.74 ± 0.01, αC1 = 1.35 ± 0.02 × 10-12erg Å-2, and βCu = 1.15 ± 0.66, βC1 = 0.0 ± 1.6 × 10-12erg Å-3. It is also shown that the temperature dependence of the Bragg reflexion observed from room temperature to 523°K can be explained very well with the use of the above parameters.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001574

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88

Digitale Medien

Determining heavy-atom positions using non-crystallographic symmetry (1974)

Argos, P. ; Rossmann, M. G.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 672-677

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: If there are a number of chemically identical molecular subunits in the asymmetric unit of the crystal cell, related by previously established non-crystallographic symmetry, it is probable that heavy atoms attached specifically to the subunits of the native molecule will show the same symmetry. The Patterson vectors between non-crystallographically equivalent heavy atoms can then be generated for arbitrary trial positions and compared with the actual Patterson synthesis. A search of all positions within the molecular subunit can thus establish the sites of larger heavy-atom substitutions. Once these have been determined, vectors between molecules can be computed and compared with the actual Patterson synthesis in order to establish the position of the molecular center if it is unknown. These methods have been demonstrated in the determination of the major heavy-atom sites, in the presence of non-crystallographic 222 symmetry, for the glyceraldehyde-3-phosphate dehydrogenase molecule.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001604

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89

Digitale Medien

The computation of radial distribution functions for glassy materials. Errata (1974)

Konnert, J. H. ; Karle, J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 679-679

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Corrections are given to equations (5), (6), (8) and (15) in the paper by Konnert & Karle [Acta Cryst. (1973). A29, 702-710].

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001628

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90

Digitale Medien

A method of determining the coincidence site lattices for cubic crystals (1974)

Grimmer, H.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 680-680

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: A quick method is presented of determining the coincidence site lattice when the original lattice is primitive cubic.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947400163X

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91

Digitale Medien

The thermal transformations in solid ammonium nitrate containing potassium and caesium ions (1974)

Srinivasan, S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 678-679

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The four solid-solid phase transformations in NH4NO3 and its solid solutions, Kx(NH4)1 - xNO3 are studied by differential thermal analysis and X-ray diffraction. The formation of the cubic phase (nearest to the melting point) is attributed to the onset of rotational disorder of the NO-3 ions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001616

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92

Digitale Medien

Notes and News (1974)

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 682-682

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001653

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93

Digitale Medien

Exact evaluation of the `interference function' (1974)

Güven, N.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 681-681

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The numerical value of the function (sin2 πMu/M2 sin2 πu) has been given in terms of the variables u and M which are independent of any real or reciprocal crystal parameters. The argument u is a fractional coordinate in reciprocal space and the variable M is the number of unit cells in a given direction.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001641

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94

Digitale Medien

Solid state chemistry and physics – an introduction. Vol. 1 by P. F. Weller (1974)

Thomas, J. M.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 682-683

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001665

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95

Digitale Medien

Electron optics by P. Grivet (1974)

Heddle, D. W. O.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 683-683

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001677

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96

Digitale Medien

The use of the scanning electron microscope by J. W. S. Hearle, J. T. Sparrow and P. M. Cross (1974)

Forty, A. J.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 683-683

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001689

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97

Digitale Medien

Solid state chemistry and physics, Vol. 2 edited by P. F. Weller (1974)

Matthew, J. A. D.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 683-684

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001690

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98

Digitale Medien

Electron spin resonance of paramagnetic crystals by L. A. Sorin and M. V. Vlasova (1974)

Whiting, J. S. S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 684-684

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001707

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99

Digitale Medien

Disorientations and coincidence rotations for cubic lattices (1974)

Grimmer, H.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 685-688

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: As a result of the cubic symmetry operations there are up to 1152 rotations describing the same relative orientation of two cubic lattices. The relation between these equivalent rotations is made transparent and it is shown how the usual definition of the disorientation has to be modified so that, in each case, the definition picks out a unique rotation among all the equivalent ones. A convenient method is described for determining all the classes of rotation that lead to coincidence-site lattices of a given density and for finding the number of rotations in each class.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001719

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100

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X-ray diffraction from close-packed structures with stacking faults. III. hhcc crystals (1974)

Lele, S.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 30 (1974), S. 693-698

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The kinematical theory of X-ray diffraction by hhcc crystals with stacking faults is developed. The intensity distribution in reciprocal space is derived as a function of seven parameters which represent four growth and three deformation fault probabilities. Only reflexions with H - K ≠ 3N, N an integer, are affected by faulting and exhibit generally changes in integrated intensity, profile peak shift, broadening and asymmetry. It is shown that eleven independent combinations of the seven fault probabilities can be evaluated from the measured profile characteristics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739474001732

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