CRYSTAL-STRUCTURE AND PHASE-TRANSITION OF ALPHA-CU2HGI4

被引：7
|
作者：
ERIKSSON, L
WANG, P
WERNER, PE
机构：
[1] Dept. of Structural Chemistry, Arrhenius Laboratory, University of Stockholm
来源：
ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 1991年 / 197卷 / 3-4期
关键词：
ALPHA-CU2HGI4; CRYSTAL STRUCTURE; PHASE TRANSITION;
D O I：
10.1524/zkri.1991.197.3-4.235
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The phase transformation of red beta-Cu2HgI4 to the black alpha-phase at 67-degrees-C has been studied by X-ray powder diffraction. It is suggested that copper and iodine occupy the same tetrahedral positions in the alpha- and beta-phases, whereas mercury is statistically distributed over two crystallographic positions in the alpha-phase. Both phases may be described in space group I42mBAR. The phase transition has been studied by X-ray powder diffraction at elevated temperatures and disintegration of the alpha-phase may occasionally be found. The structure of the alpha-phase at 85-degrees-C was determined and refined by Rietveld full-profile technique to a Bragg R-factor = 0.064.
引用
收藏
页码：235 / 242
页数：8
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