采用固相反应法制备出NaxCo2O4(x=0.9,1.1,1.3)多晶氧化物,采用水热法制备出(Bi0.1Sb0.9)2Te3单相粉末材料,再用球磨法将二者均匀混合获得了复合材料(Bi0.1Sb0.9)2Te3/NaxCo2O4.在5～300K的温度范围内,利用综合物性测试系统(PPMS)对热压复合材料的热电性能进行测量与评价.实验结果表明复合材料的热导率显著降低,同时电导率增大,与NaxCo2O4相比,复合材料的热电性能获得了显著提高.在室温下,复合材料的热电优值ZT约为3.5×10-4.热电性能的改善源于复合材料界面的声子散射的增强.
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