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  • 1
    Electronic Resource
    Electronic Resource
    X-ray Diffraction-Line Broadening Analysis: Paracrystalline Method (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 147-152 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Line-profile simulation and matching on the basis of a paracrystalline one-dimensional Hosemann model provides a promising approach to the analysis of line broadening. Results of analysis using X-ray wide-angle data of polymers and metallic samples are compared with Warren–Averbach multiple-order and single-order methods. Various column-length-distribution functions are also used for better agreement with the experimental profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889896010023
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  • 2
    Electronic Resource
    Electronic Resource
    The determination of crystal size and disorder from X-ray diffraction photographs of polymer fibres. 1. The accuracy of determination of Fourier coefficients of the intensity profile of a reflection (1989)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 22 (1989), S. 363-371 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Methods which determine the number and disorder of lattice planes in a crystal from the Fourier cosine coefficients of the intensity profile of an X-ray reflection use only the low harmonics and require that the coefficients be normalized so that the zero harmonic is unity. Experimentally, the profiles can only be recorded over a smaller range of scattering angle than required by the theory, and it is necessary to subtract background, which is likely to be estimated with considerable error, before determining the coefficients. It is shown that with polymer fibres this causes serious errors in the normalization, and in the values of those low harmonics used in the size and disorder determination, and prevents reliable values being obtained. Methods which avoid normalization and use only high harmonics are needed. It is shown that disorder may be obtained in such a way, but not size, for which low-order normalized coefficients are essential. A method of extrapolation is described and tested which enables the accurate high harmonics to be used to improve the estimates of the low ones. Whilst this will yield more reliable values of crystal size than are obtainable from existing methods, the accuracy depends entirely on the validity of the extrapolation, which cannot be tested in many cases of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889889004085
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  • 3
    Electronic Resource
    Electronic Resource
    Variation of phase lengths in wet and dry nylon 6 using SAXS data (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 657-658 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Hosemann's formula for X-ray scattering by linear paracrystal is put into a form suitable for numerical analysis using exponential distribution function for the lengths of two phases namely amorphous and crystalline. A stepping refinement procedure was used to obtain the paracrystalline parameters so that the discrepancy between the calculated and the experimental intensity was minimised. It is observed that there are significant changes in distribution of phases lengths in wet and dry nylon 6 samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889899013217
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  • 4
    Electronic Resource
    Electronic Resource
    The determination of crystal size and disorder from the X-ray diffraction photograph of polymer fibres. 2. Modelling intensity profiles (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 1051-1059 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The intensity profile of the X-ray reflection from a crystalline material is related to the lattice disorder and the distribution of crystal sizes through its Fourier cosine coefficients. However, existing methods of obtaining these structural parameters from the coefficients require more than one order of reflection and this is seldom available with polymer fibres. They also rely heavily on the low-order harmonics which are those determined with least accuracy. The development and testing of a method which overcomes this weakness and which is suitable for use with a single order is described. The coefficients are calculated for a model with paracrystalline disorder and an assumed distribution of crystal sizes and the parameters describing this model are refined to minimize the discrepancy between the calculated and experimental values of the coefficients. Provided the distribution of lengths is asymmetric this discrepancy is no greater than would be expected from experimental error and so the assumed model cannot be rejected on the evidence available. Since a range of model parameters all gave equally good agreement with experiment, it was not possible with a single order to obtain a well defined set of values. Diffraction patterns displaying two orders had been chosen and results from the second order were consistent with the first, only a narrow range satisfying both simultaneously. The method was further developed by calculating the intensity profile from the harmonics and using this in the refinement. There was no advantage over using harmonics; indeed, on occasions the refinement algorithm was unstable producing unreliable results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889891007707
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray Debye temperatures of sodium bromate-sodium chlorate solid solution single crystals (1987)
    Springer
    Journal of materials science 6 (1987), S. 207-208 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01728987
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature variation of Debye-Waller factor of KNO3 (1987)
    Springer
    Journal of materials science 6 (1987), S. 1103-1104 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729147
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature variation of the Debye-Waller factor of NaNO2 (1988)
    Springer
    Journal of materials science 7 (1988), S. 989-990 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720752
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  • 8
    Electronic Resource
    Electronic Resource
    Debye-Waller factor and Debye temperature of sodium thioantimonate (1990)
    Springer
    Journal of materials science 9 (1990), S. 279-280 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00725824
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal size and distortion parameter of natural pure mysore silk fibers (Bombyx Mori) (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 2161-2165 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Crystal size and lattice distortion parameters were determined experimentally by recording X-ray diffraction patterns of natural silk fiber (pure Mysore silk, Bombyx Mori) using Fourier cosine coefficients of the intensity profile of an X-ray (210) reflection. Also, the crystal size distribution along [210] direction is given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070441212
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of physical and chemical modifications on microcrystalline parameters of silk fibers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 1677-1681 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Wide-angle X-ray diffraction studies of physically and chemically treated silk fibers like bivoltine mulberry silk and tassar silk were carried out to evaluate their crystal size, lattice distortion, and minimum enthalpy, as these determine the properties of silk fibers. The results are also compared with tenacity measurement. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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