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  • International Union of Crystallography (IUCr)  (6,726)
  • 1975-1979  (6,726)
  • 1
    Electronic Resource
    Electronic Resource
    The analysis of X-ray diffraction profiles from imperfect solids by an application of convolution relations (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 6-9 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In this investigation an attempt has been made to correlate the experimentally observed X-ray diffraction profile from imperfect solids with the one obtained theoretically from an approach of simultaneous convolution of the true diffraction profile resulting from the imperfection content of the materials and the instrumental profile, considering realistic distribution functions. The expressions for the intensity distributions are derived from the simultaneous convolution of Schoening's true profile (originating from the Gaussian strain profile and the Cauchy crystallite-size profile) and the instrumental profile having either Gaussian or Cauchy functional forms, and the theoretical forms are compared to those observed from some silver- and copper-base cold-worked alloys and vapour-deposited thin silver films. The agreement is fairly good for both first- and second-order reflections with small deviations in the tail region, which may arise from uncertainty in the background-level estimation, consideration of functions purely symmetrical in form and neglect of absorption and TDS effects. A further agreement of Schoening's true profile with Stokes's corrected deconvoluted true profile implies the validity of Schoening's approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878012595
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Model drawing programs:production of diperiodic patterns (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 57-57 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876010534
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallographers (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 58-58 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876010558
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the dielectric behaviour of cadmium iodide polytypes (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 645-648 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The dielectric constants (εr) of cadmium iodide polytypes have been measured and found to be higher than that of the parent 4H structure. For example, whereas the εr for polytypic structures 32H and 34H is between 120 and 150, for the 4H structure it is between 20 and 25. A possible explanation for this decrease is suggested in terms of the occurrence of the stacking faults and their effect on the orientation polarizability of the cadmium iodide crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011533
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Analyse des bandes de diffraction affectées par une fonction défaut instrumentale (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 653-656 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A turbostratic layer lattice is characterized by asymmetric X-ray diffraction bands the shape of which is a function of the average diameter L of the two-dimensional scattering domains. The mathematical relationship between the band shape and L is known. The larger the domains, the narrower and more asymmetric is the band. The band width is also influenced by the instrumental broadening. Consequently the apparent diameter L, is smaller than L. The proposed graphical method allows L to be obtained from L, and from the characteristic parameters of the apparatus. The experimental results can be fitted from the convolution of the theoretical function corresponding to L with the experimentally measured instrumental broadening function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011557
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  • 6
    Electronic Resource
    Electronic Resource
    Ein neues Verfahren zur gleichzeitigen Photographie zweier Netzebenen des reziproken Gitters (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 670-673 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new experimental technique in which direct photographs of two reciprocal planes are taken simultaneously is described. The method combines the advantages of the precession method (a series of reciprocal planes is accessible with the adjustment of a single reciprocal direction) and the de Jong Bouman method (high diffraction angles are possible). Consequently many crystals (e.g. organic ones) may be measured with copper radiation without loss of information. The advantages of the new method and the final construction for practical X-ray diffractometry are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011570
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  • 7
    Electronic Resource
    Electronic Resource
    The termination effect for amorphous patterns (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 674-677 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Termination of the experimental intensity curve and the use of a convergence factor leads to an uncorrected radial distribution function which is equal to the true distribution function convoluted with a termination factor of the form sin x/x, and with a convergence factor of exponential form. Although the convolution factors are known, a deconvolution of the uncorrected curve to obtain the true radial distribution function is not possible by the usual methods. However, for the case of moderately sharp peaks on a slowly varying background, an approximate method can be developed. For each peak of the uncorrected curve, we introduce a Gaussian A exp [−a2r2] whose convolution with the termination and convergence factors has the same width and height as the peak. These Gaussians are then used for the first step in a deconvolution of the uncorrected curve. Although it is approximate, the resulting curve is closer to the true distribution function than the original uncorrected curve, and the termination ripples have been eliminated. The method is completely objective, and free from all arbitrary adjustments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011582
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal data for the tetraphenylarsonium salt of the monoanion of theophylline, [(C6H5)4As] [C7N4O2H7].5H2O (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 686-686 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The title compound crystallizes in the triclinic system with a = 13.13 (1), b= 19.80 (2), c = 12.916 (3) Å, α = 90.01 (5), β = 102.96 (6), γ = 96.45 (7)°, V= 3251.6 Å3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011636
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  • 9
    Electronic Resource
    Electronic Resource
    An X-ray study of silver amalgam and its stoichiometry (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 693-694 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The powder diffraction data and the cell constants of silver amalgam crystal (grown from N/50 AgNO3 solution and a globule of mercury) are given. The formula AgHg for the compound is suggested on the basis of X-ray data and chemical analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011661
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  • 10
    Electronic Resource
    Electronic Resource
    Acta Crystallographica and Journals of Applied Crystallography (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 696-697 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011703
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