Observation of phase transition of cesium manganese hexacyanoferrates by X-ray absorption spectroscopy

被引:4
|
作者
Ishiji, Korato [1 ]
Matsuda, Tomoyuki [2 ,3 ]
Tokoro, Hiroko [2 ,3 ]
Iwazumi, Toshiaki [1 ]
Hashimoto, Kazuhito [2 ]
Ohkoshi, Shin-ichi [2 ,3 ]
机构
[1] Inst Mat Struct Sci, Photon Factory, Tsukuba 3050801, Japan
[2] Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan
[3] Univ Tokyo, Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan
关键词
A. magnetic materials; B. chemical synthesis; C. XAFS (EXAFS and XANES); D. electrical properties;
D O I
10.1016/j.jpcs.2007.08.043
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Cesium manganese hexacyanoferrates exhibit an interesting phenomenon of temperature-induced phase transition accompanied by a variation in the magnetic susceptibility. We observed the variation in the electronic state of Mn during the phase transition by using X-ray absorption spectroscopy. The results of the analyses showed that the content ratio of Fe-II-CN-Mn-III and Fe-III-CN-Mn-II systematically varied during the phase transition. However, the ratio of Fe-II-CN-Mn-II remained constant at almost all temperatures. These results suggest that the charge transfer between Fe and Mn ions in the Fe-II-CN-Mn-II or the Fe-II-N-Mn-III bond produces the phase transition. (c) 2007 Published by Elsevier Ltd.
引用
收藏
页码:2158 / 2161
页数:4
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