中文摘要：

采用溶胶一凝胶法制备化合物Yo．95-Ro．05C0O3（R=Ca，Sr，Ba），研究了碱土元素替代对YC003电输运和热电性能的影响。结果表明，随着替代离子Ca2＋、Sr2＋、Ba2＋离子半径的增大，在相应温度下替代化合物Y0．95-R0．05C0O3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Ca2＋离子替代能有效提高YC003体系高温热电功率因子。

英文摘要：

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＋.