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1

Digitale Medien

A computer holographic method for the optical reconstruction of a molecular image from X-ray diffraction data (1974)

Sakurai, T. ; Karibe, M. ; Yatagai, T.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 399-400

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: A new method for the phase control in an optical diffractometer is described. A photographic negative of the weighted reciprocal net is used as the mask of the diffractometer. The phase of each reciprocal point is represented by the shift of the position in the reciprocal plane. Although this method cannot reproduce the periodic image of a crystal, it is particularly suitable for reconstructing the image of a molecule in a crystal.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874009903

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2

Digitale Medien

Wave propagation in elastic solids by J. D. Achenbach (1974)

Hopkins, H. G.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 408-408

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010004

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3

Digitale Medien

Crystal data for ammonium tri- and tetrapolyphosphates (1974)

Waerstad, K. R. ; McClellan, G. H.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 404-405

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: Unit-cell parameters and space groups have been determined on four ammonium polyphosphate salts. (NH4)5P3O10.2H2O is monoclinic with space group P21/n, a = 16.643, b = 6.719, c = 13.843, β = 98.61. (NH4)5P3O10.H2O is monoclinic, space group P2/n or Pn, a = 10.949, b = 10.377, c = 6.426, β = 91.06. (NH4)6P4O13.2H2O is triclinic, a =13.426, b = 11.874, c = 6.524, α = 93.80, β = 84.78, γ = 106.97. (NH4)4 H2P4O13 is orthorhombic, space group P22121, a = 13.359, b = 13.244, c = 8.214.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874009940

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4

Digitale Medien

A simple structure-building technique (1974)

Webster, M.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 406-406

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874009964

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5

Digitale Medien

Unit pressures of extractive metallurgy by R. D. Pehlke (1974)

Gilchrist, J. D.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 408-408

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010016

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6

Digitale Medien

Données cristallographiques sur deux phosphates acides de zinc: Zn(H2PO4)2.2H2O et ZnH2P2O7 (1974)

Averbuch-Pouchot, M. T.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 511-512

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: Crystal data for Zn(H2PO4)2. 2H2O and ZnH2P2O7 are given. The two compounds crystallize in the monoclinic system. The monophosphate is isotypic with Cd(H2PO4)2.2H2O.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010314

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7

Digitale Medien

Introduction to the properties of crystal surfaces by J. M. Blakely (1974)

Chambers, A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 513-513

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188987401034X

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8

Digitale Medien

Growth of unusual silicon carbide polytypes by island formation (1974)

Ram, U. ; Dubey, M. ; Singh, G.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 515-518

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: Unusual SiC polytypic features have been studied by X-ray diffraction and chemical etching to increase understanding of their growth mechanism. The feasibility of periodic slip as a possible mode of growth of SiC polytypes has been examined. It is proposed that island formation on the helicoidal growth surface is responsible for most of the unusual SiC polytypes not explicable purely in terms of a screw-dislocation mechanism.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010363

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9

Digitale Medien

Quantitative interpretation of X-ray diffraction patterns of mixtures. II. Adiabatic principle of X-ray diffraction analysis of mixtures (1974)

Chung, F. H.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 526-531

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: All the information relating to the quantitative composition of a mixture is coded and stored in its X-ray diffraction pattern. It has been the goal of X-ray diffraction analysts since the discovery of X-rays to retrieve and decode this information directly from the X-ray diffraction pattern rather than resort to calibration curves or internal standards. This goal appears to be attained by the application of the `matrix-flushing theory' and the now-proposed `adiabatic principle' in applied X-ray diffraction analysis. The matrix-flushing theory offers a simple intensity-concentration equation free from matrix effects which degenerates to `auto-flushing' for binary systems. The adiabatic principle establishes that the intensity–concentration relationship between each and every pair of components in a multi component system is not perturbed by the presence or absence of other components. A key equation is derived which conducts the decoding process. Both the matrix-flushing theory and the adiabatic principle are experimentally verified.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010387

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10

Digitale Medien

An immobile dislocation arrangement in as-grown copper single crystals observed by X-ray topography (1974)

Kuriyama, M. ; Early, J. G. ; Burdette, H. E.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 7 (1974), S. 535-540

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ISSN: 1600-5767

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

Thema: Geologie und Paläontologie , Physik

Notizen: X-ray diffraction topography using transmission geometry has revealed an interesting array of extremely straight and narrow long-line images in sizeable copper single crystals grown under particular growth conditions by the Czochralski technique. These images are analyzed and elucidated by a model of Lomer–Cottrell dislocations. The formation of these sessile dislocations usually aids the growth of large copper crystals of high perfection. The high degree of perfection over the entire volume of the crystals accounts for macroscopic arrangements of Lomer–Cottrell dislocations which have not previously been observed by electron microscopic techniques.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889874010405

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