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  • Articles  (241)
  • Cambridge University Press  (128)
  • International Union of Crystallography (IUCr)  (113)
  • American Geophysical Union (AGU)
  • 1980-1984  (93)
  • 1975-1979  (108)
  • 1965-1969  (38)
  • 1940-1944  (2)
Collection
  • Articles  (241)
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  • 1
    Electronic Resource
    Electronic Resource
    Crystal data for hexamethylenetetraselenafulvalene-perfluorotetracyanoquinodimethane (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 95-96 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The cell constants for the title compound, HMTSFT–CNQ4, (C12F4N4).(C12H12Se4), M.W. 748.21, were determined from a single crystal exposed on a Syntex P{\bar 1} automated diffractometer and then refined from precision powder data with Cr Kα1 (2.28962 Å): a = 21.906 (5), b = 12.918 (3), c = 4.0184 (10) Å and β = 91.658 (10)°; U = 1136.7 Å3, Z = 2, space group C2/m; Dc = 2.186 Mg m−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880011569
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  • 2
    Electronic Resource
    Electronic Resource
    An error assessment of single-crystal 2πdata from four-circle diffractometry (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 126-132 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The criteria developed in the error analysis of 2θ powder data for cubic and uniaxial phases [Frevel (1978). J. Appl. Cryst. 11, 184–189] are extended to biaxial single-crystal data. A methodology is described for applying the focusing matrix method to exhaustive sets of 2θ data for pinacoid and prism reflections measured on a four-circle diffractometer. A spheroidal crystal of hyperpure Si is used to calibrate a Syntex P{\bar 1} automated diffractometer and to establish an effective wavelength for graphite-monochromated Mo Kβ1β3 radiation. A high-quality single-crystal of cis-[bis(7,9-dimethylhypoxanthine) (ethylenediamine)platinum(II)] hexafluorophosphate, [Pt(C2H8N2)(C 7H8N4O)2].(PF6)2, serves as a test case for comparing the normal least-squared analysis with the focusing matrix method. It is concluded that an absolute accuracy greater than one part in 2000 for cell constants of biaxial crystals is difficult to achieve from automated four-circle diffractometer data (2θ ≤ 40°) for non-spheroidal crystals with linear dimensions ca 0.2 mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889883010043
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  • 3
    Electronic Resource
    Electronic Resource
    4,4',5,5-Tetramethyl-Δ2,2'-bis-1,3-diselenole, TMTSF (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 772-775 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740879004751
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of the red, semiconducting form of 4,4',5,5'-tetramethyl-Δ2,2'-bi-1,3-diselenole-7,7,8,8-tetracyano-p-quinodimethane, TMTSF–TCNQ (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 1193-1199 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740882005275
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the 00l reflections of carbons (1968)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 1 (1968), S. 313-317 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In an earlier communication by the authors it was shown that the stack height distribution in a raw carbon black followed an exponential law. Extension of these studies to a heat-treated (2000°C) black showed that the exponential law is still valid when stacking is extensive. The exponential law and the effect of heat-treatment are explained by the existence in blacks of extensive stratification rather than the presence of short stacks of small layers. Evidently heat-treatment results in annealing of the strata to yield uniform layer domains and more ordered stacking. Simple expressions are derived for calculating the profiles of the 00l reflections and the coefficient of the exponent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188986800556X
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal data for thallium germanium sulphide, Tl2GeS3 (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 391-391 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Crystals of Tl2GeS3 were grown by solidification from melts. The compound is triclinic with lattice parameters a = 8.06, b = 12.70, c = 6.76 Å, α = 96°39′, β = 93°10′, γ = 99°31′. Powder data are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875010771
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal data for diphenylsilanediol, (C6H3)2Si(OH)2 (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 670-671 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The cell constants of recrystallized diphenylsilanediol were refined from precision powder data taken with Cr Kα1 (2.28962 Å): a = 14.493 (5); b = 15.012 (6); c = 9.897 (6) Å; α = 100.84 (9); β = 100.01 (5); γ = 120.77 (5); U = 1721.6 Å3; Z = 6; Dm (25°C) = 1.255 (3); Dx = 1.252 g cm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987801420X
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal data for the fluoroalleghanyite series nMn2SiO4MnF2(1,n〈4) (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 574-576 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Unit-cell constants for synthetic fluoroalleghanyite compounds have been determined by the refinement of X-ray powder diffraction data. Manganese norbergite: Pbnm, a = 4.862(2), b = 10.797(3), c = 9.188(2) Å, U = 482.4(4) Å3, Z = 4; alleghanyite: P21/b, a = 4.871(2), b = 10.818(6), c = 8.206(5) Å, α = 108.58(5)°, U = 414.1(7) Å3, Z = 2; manganhumite: Pbnm, a = 4.888 (2), b = 10.712(2), c = 21.749(6), U = 1138.8(5) Å3, Z = 4; sonolite: P21/b, a = 4.889(1), b = 10.668(3), c = 14.239(5), α = 100.83(5)°, U = 731.9(5) Å3, Z = 2. The JCPDS Powder Diffraction File numbers are: for manganese norbergerite 33–1500; for alleghanyite 33–1499; for manganhumite 33–1498; for sonolite 33–1497.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882012631
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  • 9
    Electronic Resource
    Electronic Resource
    Oscillation camera data processing: reflecting range and prediction of partiality. I. Conventional X-ray sources (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 338-351 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Expressions are developed for reflecting range from various models, and the practical application of these in terms of reflection prediction and calculation of partiality is discussed here for conventional sources. Synchrotron sources utilizing focusing monochromator systems, where the wavelength of the radiation incident at the sample is correlated with the angular direction of that radiation, are dealt with elsewhere. Even for conventional sources spectral dispersion is shown to be an important factor, particularly in the case of high-resolution data. The various published methods are discussed and expressions are derived from first principles showing that all are inherently equivalent, differing only when approximations are used, and revealing a missing factor of two in the treatments of Rossmann [J. Appl. Cryst. (1979), 12, 225–238] and Rossmann, Leslie, Abdel-Meguid & Tsukihara [J. Appl. Cryst. (1979), 12, 570–581]. Particular emphasis is placed on the method which uses a spherical reciprocal-lattice volume element whose dimensions are designed to reproduce the expected or observed reflecting ranges, showing that for all practical purposes the effects of beam cross-fire, mosaic spread and spectral dispersion can be adequately simulated by such a volume. The equations for reflecting range are of particular interest in the electronic stationary-picture method and in the use of electronic area detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882012072
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  • 10
    Electronic Resource
    Electronic Resource
    4a,5,8,8a-Tetrahydro-5,8-ethano-1,4-naphthoquinone (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 2840-2843 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740880010242
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