摘要
以Pb粉,Te粉和PbI2粉为原料,采用固相合成方法合成了掺杂PbI2(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PbTe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PbI2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PbI2含量为0.1at%时,PbTe合金在350℃具有最高的功率因子2.48mW/(m.K2)。
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·K2）at 350℃.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2010年第2期271-274,共4页
Journal of Materials Science and Engineering
作者简介
吴荣归（1983-），男，硕士，从事功能材料的研究。E—mail：wrggood@yahoo．com.cn。
通讯作者：徐桂英，教授。E-mail：xug：yr@mater．ustb．edu．cn。
