在尿素-NaBr-KBr-甲酰胺体系中用脉冲电沉积的方法制备Bi_2Sb_3Ce_x及Bi_2Sb_3Nd_x合金薄膜.通过X射线能谱(EDS)及X射线衍射(XRD)分别确定其化学成分、分析其晶型结构.在最佳工艺条件下,稀土元素达到最大填充量,合金薄膜的组成为Bi_2Sb_3Ce_2及Bi_2Sb_3Nd_(0.1).合金薄膜是由斜方六面体BiSb和四面立方结构的单质Ce、Nd组成.探索了不同稀土填充的Bi-Sb半导体热电材料的电学性能.
Bi_2Sb_3Ce_x and Bi_2Sb_3Nd_x alloy films were prepared by PRC method (Pulse Reverse Current) in carbamide-NaBr-KBr-methanamide system. Their chemical composition was determined by EDS and the crystalline structure was analyzed by XRD. Under the optimal processing condition, there is a maximum filling quantity of the REE and the alloy films are composed of Bi_2Sb_3Ce_2 and Bi_2Sb_3Nd_(0.1), which are rhombic hexahedral BiSb and tetrahedral cubic monoplasmatic Ce and Nd. The conductivity of Bi-Sb semiconductor pyroelectric materials stuffed by different REEs was also discussed.
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