采用真空熔炼及热压烧结技术制备了Na和Al双掺杂P型Bi0.5Sb1.5Te3热电材料.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分析结果表明,Na0.04Bi0.5Sbl.46-xAlxTe3块体材料的XRD图谱与块体材料Bi0.5Sb1.5Te3的图谱完全对应,所有块体材料的衍射峰均与衍射卡JCPDS 49-1713对应,这表明Na和Al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形貌表明材料组织致密且有层状结构特征.Na和Al双掺杂提高了Bi0.5Sb1.5Te3在室温附近的Seebeck系数.在Na掺杂量为0.04时,同时Al掺杂量由x=0.04增加至0.12,电导率逐渐降低,在实验掺杂浓度范围内,Na和Al双掺杂会使P型Bi0.5Sb1.5Te3材料的电导率受到较大的损失.在300～500K时,通过Na和Al部分替代Sb,Na0.04Bi0.5Sb1.42Al0.04Te3和Na0.04Bi0.5 Sbl.38Al0.08Te3样品的热导率均有不同程度地减小,在300K时双掺杂样品Na0.04Bi0.5Sb1.42Al0.04Te3的最大Zr值达到1.45.
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