PROPERTIES OF THE TRANSITION-METAL DICHALCOGENIDES - THE CASE OF IRS2 AND IRSE2

被引：55

作者：

JOBIC, S

DENIARD, P

BREC, R

ROUXEL, J

DREW, MGB

DAVID, WIF

机构：

[1] UNIV READING,DEPT CHEM,READING RG6 2AD,BERKS,ENGLAND

[2] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1990年 / 89卷 / 02期

关键词：

D O I：

10.1016/0022-4596(90)90273-Z

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The syntheses and structure determination of IrSe2 and IrS2 were undertaken. Pure phases were obtained and powder data were measured on an X-ray diffractometer. Rietveld refinement was successfully carried out for both structures [IrSe2, 269 observations R (weighted profile) 0.062; IrS2, 205 observations R (weighted profile) 0.074]. The Pnam space group (No. 62) was found to yield the best results, eliminating Pna21 as the other possible space group considered in a previous study of IrSe2. Chalcogen pairs are found in both structures and these may correspond, in a first approach, to the charge balance Ir3+X2-(X2)2- 1 2. However, long bond lengths were found in the chalcogen pairs [SS 2.299(11) Å, SeSe 2.555(4) Å] along with an unexpectedly small effective cationic radius of 0.50 Å for Ir3+. These features of IrS2 and IrSe2 are discussed. © 1990.

引用

页码：315 / 327

页数：13

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