129I Mossbauer spectroscopic study in a MMX-chain system, M2(dta)4I (M = Ni, Pt, dta = CH3CS2-)

被引：11
作者：
Kitagawa, H [1 ]
Sonoyama, T
Mitani, T
Seto, M
Maeda, Y
机构：
[1] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231290, Japan
[2] Kyoto Univ, Inst Res Reactor, Osaka 5900494, Japan
来源：
SYNTHETIC METALS | 1999年 / 103卷 / 1-3期
关键词：
MX chain; mixed valence; metal-insulator transition; Mossbauer spectroscopy; I-129; molecular conductor;
D O I：
10.1016/S0379-6779(98)00679-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The titlePt compound is a highly-conductive mixed-valence MMX-chain system. It exhibits a metal-semiconductor transition at 300 K, which is attributed to a valence transition of Pt from an average-valence state of +2.5 to a trapped-valence state of +2 and +3. From I-129 Mossbauer spectroscopic study, the 1-D structural mode was strongly suggested to be a -Pt-II -Pt-III-I-Pt-III-Pt-II -I-Pt-II-Pt-III-I-Pt-III-Pt-II- charge ordering state at 16 K. The charge-ordering mixed-valence state is discussed, as well as the valence state of the Ni compound, which is considered to be an averaged-valence Mott insulator.
引用
收藏
页码：2159 / 2160
页数：2
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