【摘要】 采用溶胶-凝胶法制备化合物Y_0.95R_0.05CoO₃（R=Ca,Sr,Ba）,研究了碱土元素替代对YCoO₃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Y_0.95R_0.05CoO₃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YCoO₃体系高温热电功率因子。更多还原

【Abstract】 The alkaline-earth metal substituted compounds Y_0.95R_0.05CoO₃（R=Ca,Sr,Ba） were prepared by sol-gel process,and the effect of substituting on its electrical transport and thermoelectric properties were systematically investigated.The results show that with the increase of Ca²⁺、Sr²⁺、Ba²⁺ ionic radius,the electrical resistivity of the Y_0.95R_0.05CO₃ compounds increases gradually,Seebeck coefficient was improving,and the power factor decreases,in corresponding temperature range.The high-temperature thermoelectric power factor of the YCoO₃ system can be improved effectively by the substitution of Ca²⁺ with smaller radius approaching that of the ion Y³⁺.更多还原