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Continuous diffuse scattering from polymethylene chains - an electron diffraction study of crystalline disorder

Continuous diffuse scattering from polymethylene chains - an electron diffraction study of... Continuous diffuse scattering is noted in electron diffraction patterns from polymethylene compounds such as n-paraffins and polyethylene. In a projection down the chain axes, experimentally produced by solution crystallization, the diffuse scatter in hk0 patterns disappears at low temperature, in accord with a thermal-diffuse-scattering model, which explains the intensity distribution and its temperature dependence. For a projection onto the chain axes, experimentally achieved by epitaxic orientation on benzoic acid crystals, the 0kl, as well as 3D projections, contain diffuse scatter which does not disappear at low termperature. Its origin appears to be due to frozen-in longitudinal chain static displacements, perhaps as much as 0.25 A, as indicated by a model for this disorder. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A: Foundations of Crystallography International Union of Crystallography

Continuous diffuse scattering from polymethylene chains - an electron diffraction study of crystalline disorder

Continuous diffuse scattering from polymethylene chains - an electron diffraction study of crystalline disorder


Abstract

Continuous diffuse scattering is noted in electron diffraction patterns from polymethylene compounds such as n-paraffins and polyethylene. In a projection down the chain axes, experimentally produced by solution crystallization, the diffuse scatter in hk0 patterns disappears at low temperature, in accord with a thermal-diffuse-scattering model, which explains the intensity distribution and its temperature dependence. For a projection onto the chain axes, experimentally achieved by epitaxic orientation on benzoic acid crystals, the 0kl, as well as 3D projections, contain diffuse scatter which does not disappear at low termperature. Its origin appears to be due to frozen-in longitudinal chain static displacements, perhaps as much as 0.25 A, as indicated by a model for this disorder.

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References (7)

Publisher
International Union of Crystallography
Copyright
Copyright (c) 1991 International Union of Crystallography
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767391003823
Publisher site
See Article on Publisher Site

Abstract

Continuous diffuse scattering is noted in electron diffraction patterns from polymethylene compounds such as n-paraffins and polyethylene. In a projection down the chain axes, experimentally produced by solution crystallization, the diffuse scatter in hk0 patterns disappears at low temperature, in accord with a thermal-diffuse-scattering model, which explains the intensity distribution and its temperature dependence. For a projection onto the chain axes, experimentally achieved by epitaxic orientation on benzoic acid crystals, the 0kl, as well as 3D projections, contain diffuse scatter which does not disappear at low termperature. Its origin appears to be due to frozen-in longitudinal chain static displacements, perhaps as much as 0.25 A, as indicated by a model for this disorder.

Journal

Acta Crystallographica Section A: Foundations of CrystallographyInternational Union of Crystallography

Published: Sep 1, 1991

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