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

页码：2159 / 2160

页数：2

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