PbTe基合金是目前性能最好的中温区热电材料,近年来受到广泛关注.本文研究了载流子浓度对Na掺杂PbTe0.8Se0.2合金热电性能的影响,在Na含量为2％时,ZT可以达到1.73.在此基础上,利用Mg合金化降低材料晶格热导率的作用,进一步提升材料的热电性能.结果表明,在Mg含量为1～3％的时,ZT值在800K附近都达到了2.0左右.
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