CONTINUOUS DIFFUSE-SCATTERING FROM POLYMETHYLENE CHAINS - AN ELECTRON-DIFFRACTION STUDY OF CRYSTALLINE DISORDER

被引：21

作者：

DORSET, DL ^{[1
]}

HU, HL ^{[1
]}

JAGER, J ^{[1
]}

机构：

[1] MAX PLANCK GESELL,FRITZ HABER INST,ELEKT MIKROSKOPIE ABT,W-1000 BERLIN 33,GERMANY

来源：

ACTA CRYSTALLOGRAPHICA SECTION A | 1991年 / 47卷

关键词：

D O I：

10.1107/S0108767391003823

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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, experimetally achieved by epitaxic orientation on benzoic acid crystals, the 0kl, as well as 3D projections, contain diffuse scatter which does not disappear at low temperature. Its origin appears to be due to frozen-in longitudinal chain static displacements, perhaps as much as 0.25 angstrom, as indicated by a model for this disorder.

引用

页码：543 / 549

页数：7

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