Structure and physical properties of the new telluride BaAg2Te2 and its quaternary variants BaCuδAg2-δTe2

被引：36

作者：

Assoud, Abdeljalil ^{[1
]}

Cui, Yanjie ^{[1
]}

Thomas, Stephanie ^{[1
]}

Sutherland, Brodie ^{[1
]}

Kleinke, Holger ^{[1
]}

机构：

[1] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2008年 / 181卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

telluride; crystal structure; electronic structure; semiconductor; physical properties;

D O I：

10.1016/j.jssc.2008.05.003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The new materials BaCu delta Ag2-delta Te2 (0 <=delta <= 2) were prepared from the elements at 800 degrees C in evacuated silica tubes. BaAg2Te2 crystallizes in the alpha-BaCu2S2 type, space group Pnma, with lattice parameters a = 10.8897(3) angstrom, b = 4.6084(1) angstrom, c = 11.8134(3) angstrom (Z = 4). The structure consists of a three-dimensional network of vertex- and edge-condensed AgTe4 tetrahedra, which includes the Ba2+ cations in linear channels running along the short b-axis. Half of the Ag atoms participate in an Ag atom zigzag chain extended parallel to the channels. BaAg2Te2 is a p-type semiconductor with large Seebeck coefficient. Within the series BaCu delta Ag2-delta Te2, the electrical conductivity increases and the Seebeck coefficient decreases strongly with increasing Cu content. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：2024 / 2030

页数：7