Pressure-induced phase transition in mixed-valence gold complexes Cs2Au2X6 (X = Cl and Br)

被引：35

作者：

Liu, XJ

Moritomo, Y ^{[1
]}

Nakamura, A

Kojima, N

机构：

[1] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, CIRSE, Nagoya, Aichi 4648603, Japan

[3] JST, PRESTO, Chiyoda Ku, Tokyo 102, Japan

[4] Univ Tokyo, Dept Pure & Appl Sci, Tokyo 153, Japan

来源：

JOURNAL OF CHEMICAL PHYSICS | 1999年 / 110卷 / 18期

关键词：

D O I：

10.1063/1.478839

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：

Effects of hydrostatic pressure on Raman spectra have been investigated in mixed-valence (MV) gold complexes Cs2Au2X6 (X=Cl and Br). We have observed pressure-induced deactivation of the Raman-active Au-X stretching modes at various temperatures, indicating a pressure-induced phase transition from the MV state to a single-valence (SV) state. The critical pressure at 300 K decreases from 10.6 GPa for X=Cl to 6.8 GPa for X=Br, perhaps due to reduced electron-phonon interaction in Cs2Au2Br6. We further derived comprehensive electronic phase diagrams of Cs2Au2X6 (X=Cl and Br) as a function of pressure and temperature. (C) 1999 American Institute of Physics. [S0021-9606(99)00417-1].

引用

页码：9174 / 9178

页数：5

共 13 条

[1] The crystal structure of cesium aurous auric chloride, Cs2AuAuCl6, and cesium argentous auric chloride, Cs-2,AgAuCl6 [J].