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采用机械合金化(MA)和放电等离子烧结(SPS)方法制备了高性能的Ag-Pb-Sb-Te体系块体热电材料.利用XRD和SEM等表征手段分析了材料的物相组成和微观结构,详细研究了组分变化,尤其是Pb含量的改变对Ag0.8Pb18+xSbTe20体系材料热电性能(包括电阻率、Seebeck系数、功率因子、热导率和热电优值等)的影响规律.研究表明,Ag-Pb-Sb-Te体系材料的最佳组成为Ag0.8Pb22.5SbTe20,对应的最大热电优值为1.2(673K).
High performance Ag-Pb-Sb-Te bulk bulk thermoelectric materials were prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The phase composition and microstructure of the materials were characterized by means of XRD and SEM , The effect of the change of composition, especially the change of Pb content, on the thermoelectric properties (including resistivity, Seebeck coefficient, power factor, thermal conductivity and thermoelectric figure of merit) of Ag0.8Pb18 + xSbTe20 system has been studied in detail. , The best composition of Ag-Pb-Sb-Te system material is Ag0.8Pb22.5SbTe20, corresponding to the maximum thermoelectric power of 1.2 (673K).