MODELING THE SILICA GLASS STRUCTURE BY THE RIETVELD METHOD

被引:111
作者
LEBAIL, A
机构
[1] Université du Maine, Faculté des Sciences, Laboratoire des Fluorures
关键词
D O I
10.1016/0022-3093(94)00664-4
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
To refine amorphous structures like crystalline ones is impossible. This statement needs now some reconsideration in the case of silica glass. Starting with a microstrained crystalline model deriving from the alpha-carnegieite structure, atomic coordinates refinements by the Rietveld method prove to be possible. The credibility of the study is supported by the simultaneous fit of neutron and X-ray diffraction data. The agreement R(chi) factors are the best ever obtained with a small-size model built exclusively from [SiO4] tetrahedra linked by corners. However it is concluded that 'best' remains insufficient.
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页码:39 / 42
页数:4
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