在Ni位点过量Ag掺杂增强ZrNiSn半heusler化合物的热电和力学性能

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Xinghui Wang, Yu Yan, Wen Zhang, Huijun Kang, Enyu Guo, Zongning Chen, Rongchun Chen, Tongmin Wang
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引用次数: 0

摘要

与全heusler化合物不同,面心立方晶体结构中的四个空位为提高半heusler化合物(HHs)的热电性能提供了额外的位点。在ZrNiSn的ni位空位中引入过量的Ag以优化热电性能。采用悬浮熔融和放电等离子烧结法制备了ZrNiAgxSn (x = 0、0.01、0.02和0.03)样品。过量Ag的引入显著提高了ZrNiAg0.01Sn的Seebeck系数,在923 K时ZrNiAg0.01Sn的峰值功率因数达到了~ 4.52 mW/(m K2),比原始ZrNiSn提高了22.8%。结果表明,在923 K时,ZrNiAg0.01Sn原始ZrNiSn的zT值由~ 0.60提高到~ 0.72。晶粒细化有效提高了ZrNiAg0.01Sn的维氏硬度,比原始ZrNiSn提高了32.8%。这些结果为设计具有优异热电性能和力学性能的zrnisn基HHs提供了可行的掺杂策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced Thermoelectric and Mechanical Properties of ZrNiSn Half-Heusler Compounds by Excess Ag Doping at Ni Sites

Different from full-Heusler compounds, four vacancies in the face-centered cubic crystal structure provide extra sites for enhancing the thermoelectric properties of half-Heusler compounds (HHs). Herein, excess Ag is introduced to the Ni-site vacancies of ZrNiSn to optimize thermoelectric properties. The ZrNiAgxSn (x = 0, 0.01, 0.02, and 0.03) samples were synthesized by levitation melting and spark plasma sintering. Remarkably, the introduction of excess Ag significantly improves the Seebeck coefficient of ZrNiAg0.01Sn, and a peak power factor of ~ 4.52 mW/(m K2) is achieved in ZrNiAg0.01Sn at 923 K, which is enhanced by 22.8% than that of pristine ZrNiSn. As a result, the figure of merit zT of pristine ZrNiSn is enhanced from ~ 0.60 to ~ 0.72 of ZrNiAg0.01Sn at 923 K. Additionally, grain refinement effectively increases the Vickers hardness of ZrNiAg0.01Sn, which is enhanced by 32.8% than that of pristine ZrNiSn. These results demonstrate a viable doping strategy for designing ZrNiSn-based HHs with excellent thermoelectric and mechanical properties.

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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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