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

页码：235 / 242

页数：8