采用真空熔炼(1073 K,8 h)和热压烧结(733 K,1 h)制备了Na掺杂P型Bi0.5 Sb1.5 Te3热电材料,并在293～473 K范围内进行了电导率、塞贝克系数测试.利用X射线衍射(XRD)、扫描电子显微镜(SEM)对样品的物相结构和表面形貌进行了表征.XRD分析表明,真空熔炼合成粉末和热压烧结块体材料的XRD图谱峰与Bi0.5Sb1.5-Te3的标准衍射图谱(01 089-4302)相对应,表明Na元素已经完全固溶到Bi0.5Sb1.5Te3晶体结构中,形成了单相固溶体合金.SEM分析说明,Bi0.Sb1.5xNax Te3热压块体材料在平行和垂直于热压方向的断面上都分布着大量的层片状结构.Na掺杂明显提高了Bi0.5Sb1.5Te3在室温附近的Seebeck系数,但降低了电导率.在实验掺杂浓度范围内,Na掺杂使P型Bi0.5 Sb1.5 Te3块体材料的功率因子均减小.
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