Influence of ionic size of rare-earth site on the thermoelectric properties of RCoO3-type perovskite cobalt oxides

被引：71

作者：

Moon, JW ^{[1
]}

Masuda, Y ^{[1
]}

Seo, WS ^{[1
]}

Koumoto, K ^{[1
]}

机构：

[1] Nagoya Univ, Dept Appl Chem, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2001年 / 85卷 / 01期

关键词：

thermoelectric; rare-earth cobalt oxide; figure-of-merit; Seebeck coefficient;

D O I：

10.1016/S0921-5107(01)00645-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermoelectric properties of Ca-doped RCoO3 (R = Pr, Nd, Sm, Cd, Dy, Ho) perovskites were studied in the temperature range of 373-1173 K. Electrical conductivity increased and Seebeck coefficient decreased with increasing the ionic radius of rare-earth elements (Ho3+ < Dy3+ < Gd3+ < Sm3+ < Nd3+ < Pr3+). At low temperatures, Seebeck coefficient (p-type) was Fairly high for all compositions and attained low and constant values at high temperatures indicating semi-metallic behavior. Similar phenomena were observed when the ionic radius of dopants (Ca2+ < Sr2+ < Ba2+) increased for (Pr0.9Ca0.1)CoO3. Electronic contribution to the thermal conductivity also increased with increasing the ionic radius of rare-earth element. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：70 / 75

页数：6

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