Crystal structures of two new oxysulfides La5Ti2MS5O7 (M = Cu, Ag):: evidence of anionic segregation

被引：47

作者：

Meignen, V ^{[1
]}

Cario, L ^{[1
]}

Lafond, A ^{[1
]}

Moëlo, Y ^{[1
]}

Guillot-Deudon, C ^{[1
]}

Meerschaut, A ^{[1
]}

机构：

[1] Univ Nantes, CNRS, UMR 6502, Inst Mat Jean Rouxel,Lab Chim Solides, F-44322 Nantes 03, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 08期

关键词：

oxysulfide; rare earth; crystal structure; optical properties;

D O I：

10.1016/j.jssc.2004.04.023

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two new compounds, La5Ti2MS5O7 (M Cu, Ag) were synthesized and their structures solved from single crystal X-ray data. Both compounds are isotypic. They crystallize in the orthorhombic system (space group Pnma, Z=4) with lattice constants a = 19.423(1) Angstrom, b 3.9793(2) Angstrom, c = 18.1191(9) Angstrom for La5Ti2CuS5O7, and a = 19.593(2) Angstrom, b = 3.9963(1) Angstrom, and c = 18.2973(15) Angstrom for La5Ti2AgS5O7. The structure of these compounds is built from fragments of the rock-salt, perovskite and fluorite types and a clear anionic segregation of the anions appears in the structure. La5Ti2CuS5O7 and La5Ti2AgS5O7 exhibit an orange-yellow color and measurement of their optical band gap gave 2.02 and 2.17eV, respectively. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：2810 / 2817

页数：8

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