Effects of the Zr0.5Hf0.5FexCo1-xSb0.8Sn0.2/Fe3Sn2 half-Heusler composites on the ZT value

被引：10
作者：
Hsu, Chia-Cheng [1 ,2 ]
Liu, Yion-Ni [2 ]
Ma, Hsiao-Kang [1 ]
机构：
[1] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan
[2] Ind Technol Res Inst, Mat & Chem Res Labs, Hsinchu 31040, Taiwan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 621卷
关键词：
Half-Heusler; Arc melting; Composite; BM-SPS; ZT; THERMOELECTRIC PROPERTIES; NANOCOMPOSITES; CONDUCTIVITY; FIGURE; MERIT;
D O I：
10.1016/j.jallcom.2014.10.007
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study aims to evaluate the effect of a composite on the microstructures and the half-Heusler Zr0.5Hf0.5FexCo1 xSn0.2Sb0.8/Fe3Sn2 (x = 0.05, 0.1 and 0.2) on the ZT value. We demonstrate that the substitution of Fe for the Co site in Zr0.5Hf0.5FexCo1 xSn0.2Sb0.8 under the arc melting process is able to promote the occurrence of a second Fe3Sn2 phase. The in-situ formed Fe3Sn2 phase was evenly dispersed on the grain boundaries and increased with increasing amounts of Fe. Such structure morphology can be treated as Zr0.5Hf0.5FexCo1 xSn0.2Sb0.8/Fe3Sn2 (x = 0.05, 0.1 and 0.2) composites. The maximum substitution of the Co site by Fe is approximately 3.32 at.%. The effects of Fe doping on the Seebeck coefficient, electrical conductivity, and thermal conductivity of Zr0.5Hf0.5FexCo1 xSn0.2Sb0.8/Fe3Sn2 (x = 0.05, 0.1 and 0.2) composites have been investigated from 300 K to 900 K. The substitution of the Co site by Fe in Zr0.5Hf0.5FexCo1 xSn0.2Sb0.8 is effective in increasing the ZT value. The maximum ZT of Zr0.5Hf0.5Fe0.1Co0.9Sn0.8Sb0.2/Fe3Sn2 can reach 0.62 at 900 K after BM-SPS processing. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：324 / 330
页数：7
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