Incommensurately modulated cadmium apatites

被引：6
|
作者：
Henning, PA [1 ]
Moustiakimov, M [1 ]
Lidin, S [1 ]
机构：
[1] Stockholm Univ, S-10691 Stockholm, Sweden
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2000年 / 150卷 / 01期
关键词：
cadmiumapatite; incommensurate modulation; bromine; iodine;
D O I：
10.1006/jssc.1999.8571
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Two cadmium apatites, Cd-5(PO4)(3)Br and Cd-5(VO4)(3)I, earlier reported to be halogenide deficient, mere prime suspects of being modulated, In this study, incommensurate ordering was found in satellites occurring in planes perpendicular to c*, The structure of Cd,(PO,),Br was refined from single-crystal X-ray diffraction data in the four-dimensional super space group R:P (3) over bar:(00 gamma): a = 16.932(2) Angstrom,= 6.451(1) Angstrom, Z = 6, R = 0.043. The modulation of the structure is due to a misfit between the large halogenide ions and the surrounding rigid Ca-PO4 substructure. From the refined model of the Cd,(PO,),Br structure a "chain-packing" model was confirmed with a Br-Br distance of 3.466 Angstrom. (C) 2000 Academic Press.
引用
收藏
页码：154 / 158
页数：5
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