Fabrication and thermoelectric properties of fine-grained TiNiSn compounds

被引：40

作者：

Zou, Minmin ^{[1
]}

Li, Jing-Feng ^{[1
]}

Du, Bing ^{[1
]}

Liu, Dawei ^{[1
]}

Kita, Takuji ^{[2
]}

机构：

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

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

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 11期

关键词：

Thermoelectric material; Half-Heusler compound; Mechanical alloying; Spark plasma sintering; FERMI-LEVEL; HEUSLER; ZRNISN; GAP; NI; TEMPERATURE; STABILITY;

D O I：

10.1016/j.jssc.2009.09.003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Nearly single-phased TiNiSn half-Heusler compound thermoelectric materials were synthesized by combining mechanical alloying (MA) and spark plasma sintering (SPS) in order to reduce its thermal conductivity by refining the grain sizes. Although TiNiSn compound powders were not synthesized directly via MA, dense bulk samples of TiNiSn compound were obtained by the subsequent SPS treatment. It was found that an excessive Ti addition relative to the TiNiSn stoichiometry is effective in increasing the phase purity of TiNiSn half-Heusler phase in the bulk samples, by compensating for the Ti loss caused by the oxidation of Ti powders and MA processing. The maximum power factor value obtained in the Ti-compensated sample is 1720 mu W m(-1) K-2 at 685 K, A relatively high ZT value of 0.32 is achieved at 785 K for the present undoped TiNiSn compound polycrystals. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：3138 / 3142

页数：5

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