Enhanced power factor and reduced thermal conductivity of a half-Heusler derivative Ti9Ni7Sn8: A bulk nanocomposite thermoelectric material

被引：28

作者：

Misra, D. K. ^{[1
]}

Rajput, A. ^{[1
]}

Bhardwaj, A. ^{[1
]}

Chauhan, N. S. ^{[1
]}

Singh, Sanjay ^{[2
]}

机构：

[1] CSIR Natl Phys Lab, CSIR Network Inst Solar Energy, Div Mat Phys & Engn, New Delhi 110012, India

[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 10期

关键词：

ELECTRICAL-CONDUCTIVITY; ELECTRONIC-STRUCTURE; PHASE-SEPARATION; HIGH FIGURE; MERIT; PERFORMANCE; THERMOPOWER; ALLOYS; TINISN; COMPOUND;

D O I：

10.1063/1.4914504

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a half-Heusler (HH) derivative Ti9Ni7Sn8 with VEC = 17.25 to investigate the structural changes for the optimization of high thermoelectric performance. The structural analysis reveals that the resulting material is a nanocomposite of HH and full-Heusler with traces of Ti6Sn5 type-phase. Interestingly, present nanocomposite exhibits a significant decrease in thermal conductivity due to phonon scattering and improvement in the power factor due to combined effect of nanoinclusion-induced electron injection and electron scattering at interfaces, leading to a boost in the ZT value to 0.32 at 773 K, which is 60% higher than its bulk counterpart HH TiNiSn. (C) 2015 AIP Publishing LLC.

引用

页数：5

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