(1. 浙江大学 硅材料国家重点实验室， 杭州 310027;
2. 太原理工大学 材料科学与工程学院， 太原 030024)
摘 要: 用溶剂热法合成了二元Bi2Te3和三元Bi1.3Sn0.7Te3合金纳米粉末， 并采用热压技术制备了块状热电材料。 XRD分析结果表明： Bi-Sn-Te三元固溶体合金可以直接通过溶剂热合成获得单相产物， 而非掺杂Bi2Te3合金需要通过热压等后热处理来实现产物的单一化； 热压过程有助于促进反应的完全和晶型的完整， 但会导致晶粒的长大。 对试样电导率σ和Seebeck系数α的测量结果显示， Bi-Sn-Te三元固溶体合金比二元Bi-Te合金具有更好的电学性能。
关键字: 热压； 溶剂热合成；Bi2Te3基合金； 热电材料； 电学性能
prepared by solvothermal synthesis
（1. State Key Laboratory of Silicon Materials,
Zhejiang University, Hangzhou 310027, China;
2. Institute of Materials Science and Engineering,
Taiyuan University of Technology, Taiyuan 030024, China）
Abstract: Binary Bi2Te3 and ternary Bi1.3Sn0.7Te3 thermoelectric samples were prepared by hot pressing from the solvothermally synthesized nano-powders. The XRD analyses show that a single-phased ternary Bi-Sn-Te alloy can be obtained directly by solvothermal synthesis. Hot pressing can facilitate the integrality of reaction and the crystalline structure, but will induce the grain growth. The measured results of electric conductivity(σ) and Seebeck coefficients(α) of the samples indicate that the ternary Bi-Sn-Te alloy has better electric properties than the binary Bi-Te alloy does.
Key words: hot pressing; solvothermal synthesis; Bi2Te3 based alloys; thermoelectric materials; electric properties
