铜掺杂量对钴酸钙热电性能的影响研究

Effects of Cu doping amount on the thermoelectric property of Ca_3Co_4O_9

采用sol-gel法制备了掺Cu的钴酸钙(Ca3Co4O9)热电材料,研究了Cu掺杂量对其物相、电导率σ、Seebeck系数S和功率因子P的影响。结果表明:随着Cu掺杂量的增加,试样中Ca3Co4O9的含量下降,但试样的电导率增加;试样的Seebeck系数和功率因子先增加后下降。试样(Ca0.90Cu0.10)3Co4O9在973 K时的功率因子最大,为15.3×10–4 W.m–1.K–2。

Thermoelectric materials of Ca3Co4O9 doped with different amount Cu were prepared by the sol-gel method.The effects of Cu doping amount on the crystal phase,conductivity,Seebeck coefficient and power factor of obtained sample were studied.The results indicate that with the increase of Cu-doping amount,the content of Ca3Co4O9 phase in the sample decreases,but the conductivity increases,while Seebeck coefficient and power factor of the sample firstly increase and then decrease.The sample of（Ca0.90Cu0.10）3Co4O9 possesses the biggest power factor 15.3×10^–4 W·m^-1·K^-2 at 973 K.