X-ray absorption spectroscopic analysis of CuIr2S4

被引：8
|
作者：
Kijima, N. [1 ]
Yashiro, H. [2 ]
Awaka, J. [1 ]
Akimoto, J. [1 ]
Nagata, S. [3 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan
[2] Rigaku Corp, Tokyo 1968666, Japan
[3] Muroran Inst Technol, Dept Mat Sci & Engn, Muroran, Hokkaido 0508585, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 480卷 / 01期
关键词：
Transition metal alloys and compounds; Solid state reactions; Electronic properties; X-ray absorption fine structure; METAL-INSULATOR-TRANSITION; SUPERCONDUCTIVITY;
D O I：
10.1016/j.jallcom.2008.09.199
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The thiospinel CuIr2S4 undergoes a temperature-induced metal-insulator transition around 230 K with structure transformation. We report on the results of X-ray absorption fine structure (XAFS) studies at the Cu K-edge and It L-[I]-edge of CuIr2S4. X-ray absorption spectra were measured by a laboratory XAFS apparatus over the temperature range from 50 to 300 K. The Cu K-edge X-ray absorption near edge structure (XANES) spectra verified that Cu in CuIr2S4 is monovalent, whereas Cu in spinel-type oxide CuRh2O4 is divalent. Chemical shift of It L-[I]-edge XANES spectrum of CuIr2S4 was larger than IrCl3, and smaller than IrO2. This finding supports the presence of both Ir3+ and Ir4+ in CuIr2S4. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：120 / 122
页数：3
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