Local structure of a trapped photoexcited state of a Fe-Co cyanide studied by x-ray-absorption fine-structure spectroscopy

被引:65
作者
Yokoyama, T
Kiguchi, M
Ohta, T
Sato, O
Einaga, Y
Hashimoto, K
机构
[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan
[2] Kanagawa Acad Sci & Technol, Tokyo Inst Polytech, Atsugi, Kanagawa 2430213, Japan
[3] Univ Tokyo, Grad Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1130033, Japan
[4] Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, Tokyo 1530041, Japan
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 13期
关键词
D O I
10.1103/PhysRevB.60.9340
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The local structure of a trapped photoexcited state of a Fe-Co cyanide magnetic material, Na0.4Co1.3Fe(CN)(6). 5H(2)O, was investigated by Fe and Co K-edge x-ray-absorption fine-structure spectroscopy. The excited state was prepared by visible-light irradiation at 36 K. In order to obtain detailed structural information, temperature dependence of the local structure was also studied without light irradiation. The Fe-C distance shows almost no change by light irradiation (1.92 Angstrom before and after irradiation), while the average Co-N/O distance is noticeably elongated (1.94 and 2.08 Angstrom before and after irradiation, respectively). This phase transformation is caused by the charge transfer from the Fe-II(S=0)-CN-Co-III(S=0) configuration to Fe-III(S =1/2)-CN-Co-II(S=3/2). The local structure of the trapped photoexcited state was found to be identical with that of the high-temperature phase, although the high-temperature phase was created much more effectively by light irradiation than thermal activation.
引用
收藏
页码:9340 / 9346
页数:7
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