Thermoelectric properties of fine-grained FeVSb half-Heusler alloys tuned to p-type by substituting vanadium with titanium

被引：47

作者：

Zou, Minmin ^{[1
]}

Li, Jing-Feng ^{[1
]}

Kita, Takuji ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Toyota Motor Co Ltd, Higashifuji Tech Ctr, Vehicle Engn Grp, Adv Mat Engn Div, Susono, Shizuoka 4101193, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2013年 / 198卷

关键词：

Thermoelectric materials; Half-Heusler alloys; Electrical properties; Thermal conductivity; ELECTRICAL-TRANSPORT PROPERTIES; PERFORMANCE; STABILITY; COMPOUND; PURE; NI;

D O I：

10.1016/j.jssc.2012.09.043

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Fine-grained Ti-doped FeVSb half-Heusler alloys were synthesized by combining mechanical alloying and spark plasma sintering and their thermoelectric properties were investigated with an emphasis on the influences of Ti doping and phase purity. It was found that substituting V with Ti can change the electrical transport behavior from n-type to p-type due to one less valence electron of Ti than V, and the sample with nominal composition FeV0.8Ti0.4Sb exhibits the largest Seebeck coefficient and the maximum power factor. By optimizing the sintering temperature and applying annealing treatment, the power factor is significantly improved and the thermal conductivity is reduced simultaneously, resulting in a ZT value of 0.43 at 500 degrees C, which is relatively high as for p-type half-Heusler alloys containing earth-abundant elements. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：125 / 130

页数：6

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