Enhanced thermoelectric properties of bulk TiNiSn via formation of a TiNi2Sn second phase

被引：64

作者：

Douglas, Jason E. ^{[1
,2
]}

Birkel, Christina S. ^{[2
,3
]}

Miao, Mao-Sheng ^{[2
]}

Torbet, Chris J. ^{[1
]}

Stucky, Galen D. ^{[1
,3
]}

Pollock, Tresa M. ^{[1
,2
]}

Seshadri, Ram ^{[1
,2
,3
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA

来源：

APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 18期

基金：

美国国家科学基金会;

关键词：

HALF-HEUSLER ALLOYS; CONDUCTIVITY;

D O I：

10.1063/1.4765358

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of phase-segregated Heusler TiNi2Sn on high temperature thermoelectric properties of bulk half-Heusler TiNiSn has been studied. In samples expressed by the composition TiNi1+xSn, a significant decrease in thermal conductivity (between 10% and 30%) is observed for two-phase TiNi1.15Sn, despite the second-phase particles existing at the micrometer scale; a 50% increase in the electrical conductivity is also measured. These result in a maximum figure of merit, ZT, of 0.44 at 800 K, which is 25% greater than is observed for the x = 0 sample. Density functional calculations of TiNiSn and TiNi2Sn suggest that the latter should deplete carriers at OK. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765358]

引用

页数：4

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