Ce掺杂Ca_3Co_4O_9的高温热电性能

摘要

Thermoelectric materials Ca3Co4O9 doped with Ce in the composition of Ca3Co4O9 （x = 0,0.1,0.3） were prepared by solid state reaction. The phase structures and microstructures of the oxides were investigated and the Seebeck coefficient,electrical conductivity and thermal conductivity were measured from room tempera- ture to 973 K. It was found that the electrical resistivity and thermal conductivity decrease with an increase of temperature. While the Seebeck coefficient increases with an increase of temperature. The maximum figure of merit 0.23 is obtained for the Ce0.1Ca2. 9Co4O9 at 973K.%利用二次固相反应方法制备了Ce掺杂的Ca3Co4O9热电材料（CexCa3-xCo4O9,x=0、0.1、0.3）,并测试了样品的微观结构和高温热电性能。测试结果表明,Ce替代Ca可有效调制Ca3Co4O9的热电参数;随着温度的升高,样品的电阻率和热导率降低,See-beck系数增大。在973K的温度下,Ce0.1Ca2.9Co4O9具有最高的热电性能（ZT=0.23）。