文献类型：期刊文献

英文题名：Preparation and thermoelectric properties of Cd_3-xA_xTeO₆ (A = In, La, and Bi) ceramics

作者：Luan, WL; Shan, YJ; Itoh, M; Imoto, H

机构：[1]Utsunomiya Univ, Dept Appl Chem, Fac Engn, Utsunomiya, Tochigi 3218585, Japan;[2]E China Univ Sci & Technol, Dept Mech Engn, Shanghai 200237, Peoples R China;[3]Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

年份：2005

卷号：31

期号：1

起止页码：129

外文期刊名：CERAMICS INTERNATIONAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000225856600020)】；

语种：英文

外文关键词：thermoelectric properties; cadmium tellurate; perovskite oxide

摘要：Due to its close-shelled electron configuration, perovskite structured oxide Cd3TeO6 was originally regarded as an electric insulator. When Cd3TeO6 was electron-doped by the substitution of trivalent cations (In3+, La3+ and Bi3+) and the introduction of oxygen vacancies, all samples showed bright changes on thermoelectric properties. A substantial negative temperature dependence of resistivity was observed in non-substituted Cd3TeO6, while substituted samples showed a slight dependence on temperature. Obviously resistivity degradation was found on air-sintered samples after nitrogen treatment. The negative Seebeck coefficient and Hall coefficient obtained indicated that electrons were the charge carriers. Among the three types of substituted cations, indium exerted the largest effect on the decrease of resistivity down to 1.3 mOmega cm at room temperature. The best thermoelectric power factor of 1.35 x 10(-4) W m(-1) K-2 was obtained for Cd2.97In0.03TeO6 at 300 K.