钙钛矿型热电氧化物Y_(0.95)R_(0.05)CoO_3(R=Ca,Sr,Ba)的制备和热电性能  

Fabrication and Thermoelectric Properties of Peovskite-type Thermoelectric Oxide Y_(0.95)R_(0.05)CoO_3(R=Ca,Sr,Ba)

作　　者：刘义[1] 李海金[1] 张清[1] 刘厚通[1] 

机构地区：[1]安徽工业大学数理学院,马鞍山243032

出　　处：《材料研究学报》2012年第1期31-36,共6页Chinese Journal of Materials Research

基　　金：国家自然基金41075027;安徽省高等学校省级自然科学重点研究KJ2011A053;安徽省高等学校省级教学研究项目2008jyxm313;中国科学院新型薄膜太阳电池重点实验室开放研究基金KF201101资助项目~~

摘　　要：采用溶胶-凝胶法制备化合物Y_(0.95)R_(0.05)CoO_3(R=Ca,Sr,Ba),研究了碱土元素替代对YCoO_3电输运和热电性能的影响。结果表明,随着替代离子Ca^(2+)、Sr^(2+)、Ba^(2+)离子半径的增大,在相应温度下替代化合物Y_(0.95)R_(0.05)CoO_3的电阻率逐渐增大,Seebeck系数增大,功率因子降低。离子半径较小且与替代离子半径相近的Ca^(2+)离子替代能有效提高YCoO_3体系高温热电功率因子。The alkaline-earth metal substituted compounds Yo.95Ro.05Co03 （R=Ca, Sr, Ba） were prepared by sol-gel process, and the effect of substituting on its electrical transport and thermoelectric prop- erties were systematically investigated. The results show that with the increase of Ca2＋, Sr2＋, Ba2＋ ionic radius, the electrical resistivity of the Yo.95Ro.05CoO3 compounds increases gradually, Seebeck coefficient was improving, and the power factor decreases, in corresponding temperature range. The high-temperature thermoelectric power factor of the YCo03 system can be improved effectively by the substitution of Ca2＋ with smaller radius approaching that of the ion y3＋.

关 键 词：无机非金属材料 热电材料 溶胶-凝胶 YCoO_3 

分 类 号：TB321[一般工业技术—材料科学与工程]