新型热电材料β-Zn_4Sb_3的电学性能

Transport Properties of a New Type of Thermoelectric Material β-Zn_4Sb_3

采用真空熔炼和烧结的方法制备了新型热电材料尽β－Ｚｎ４Ｓｂ３。Ｘ射线衍射分析表明样品为单相。２种样品从室温到７２３Ｋ温度范围内的电学性能测量表明，β－Ｚｎ４Ｓｂ３在５００Ｋ～６５０Ｋ时具有较高的功率因子，真空熔炼样品的性能要优于烧结样品，其功率因子在 ６２３Ｋ时达到最大值 ３．９μＷ．ｃｍ－１．Ｋ－２。结果表明，β－Ｚｎ４Ｓｂ３在热电转换领域有潜在的应用前景。

Samples of thermoelectric material β-Zn4Sb3 were prepared by vacuum melting and sintering. X-ray analysis reveals that single-phased β-Zn4Sb3 has been obtained. Transport properties of samples were measured between room temperature and 723 K. The experimental results show that the melted β-Zn4Sb3 has high power factor in the 500K-650K temperature range, compared to the sintered one, and a maximum value of about 3.9-μW.cm-1.K-2 is achieved at 623K. This value is comparable with the p-type state-of-the-art thermoelectric materials such as Bi2Te3-based alloys. The β-Zn4Sb3 with good performance is very promising for thermoelectric applications.