Na/Cu双掺杂对Ca3Co4O9热电材料性能的影响  

Effect of Na/Cu Double Doping on the Thermoelectric Properties of Ca_3Co_4O_9 Thermoelectric Material

作　　者：李佳书[1] 胡志强[1] 郝洪顺[1] 秦艺颖 李亚玮[1] 

机构地区：[1]大连工业大学纺织与材料工程学院,新能源材料实验室,辽宁大连116034

出　　处：《陶瓷学报》2016年第2期179-183,共5页Journal of Ceramics

摘　　要：利用溶胶-凝胶法制备掺Na/Cu的Ca_3CO_4O_9热电材料,通过XRD、SEM、气孔率对样品进行表征,研究Na/Cu的掺量对试样的电阻率、塞贝克系数和功率因子的影响。结果表明,双掺之后的XRD图谱与标准JCPDS图谱保持一致,没有引进新的杂质;通过双掺样品的致密性提高,电阻率大幅降低;随着温度增加,电阻率随之降低,Seebeck系数增大,功率因子增大,热电性能得到提高,在1050 K时,(Na_(0.1)Ca_(0.9))_3(Co_(0.9)Cu_(0.1))_4O_9试样的功率因子最高达到448μW/m K^2。Ca_3Co_4O_9 thermoelectric material doped with Na/Cu were prepared by the sol-gel method.The samples were characterized by XRD,SEM and porosity measurement.The effects of Na/Cu dosage on the resistivity,Seebeck coefficient and power factor of samples were explored.The results showed that the XRD patterns of double-doped samples were consistent with the standard JCPDS pattern,and no impurities were found.The density of the double doped samples was improved,and their resistivity was greatly reduced.With the temperature increasing,the resistivity decreased,Seebeck coefficient and the power factor increased,and the thermoelectric performance improved;at 1050 K,the power factor of the（Na_（0.1）Ca_（0.9））_3（Co_（0.9）Cu_（0.1））_4O_9 sample reached 448 μW/m K^2.

关 键 词：Na-Cu双掺 Ca_3Co_4O_9 热电材料 电阻率 SEEBECK系数 

分 类 号：TQ174.75[化学工程—陶瓷工业]