以Pb粉,Te粉和PBi_2粉为原料,采用固相合成方法合成了掺杂PBi_2(0.03,0.05,0.1,0.3at%)N型PbTe合金,XRD分析表明,合金具有NaCl型面心立方结构.采用热压烧结法将PhTe合金粉末烧结成块体材料,运用XRD,SEM方法对材料的物相组成和形貌进行了表征,表明热压烧结后材料仍保持NaCl型面心立方结构,出现偏析现象,分为富Te相和富Pb相,其中富Pb相呈现片状.通过材料热电性能参数的测试,研究了20MPa下不同热压烧结温度,不同含量PhI_2掺杂对材料热电性能的影响,结果表明合理热压烧结温度对材料的热电性能提高起到关键作用,当PBi_2含量为0.1at%时,PbTe合金在350℃具有最高的功率因子2.48mW/(m·K~2).
N-type PbTe alloys doped with PBi_2 (0.03,0.05,0.1,0.3 at%) were synthesized by solid-phase synthesis method with Pb, Te and PBi_2 powders as raw materials. XRD analysis showed that the alloys have a NaCl-type face-centered cubic structure. Bulk PbTe materials were prepared by hot-pressing sintering method. XRD, SEM were used to determine the phases and morphologies, which indicate that the material after sintering process remains NaCl type face-centered cubic structure, and shows segregation phenomenon. The base body is divided into Te-rich phase and Pb-rich phase, in which Pb-rich phase presents sheet-like stracture. Thermoelectric properties of the samples prepared under 20MPa at different hot pressing temperatures, with different doping concentrations of PBi_2 were studied. The results show that a reasonable sintering temperature plays a key role on improving thermoelectric properties of PbTe alloys. The PbTe alloy with a PbI_2 content of 0.1at％ has the highest power factor of 2.48mW/(m · K~2) at 350℃.
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