Top-down method to fabricate TiNi1+xSn half-Heusler alloy with high thermoelectric performance

Top-down method to fabricate TiNi1+xSn half-Heusler alloy with high thermoelectric performance
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自上而下法制备高热电性能TiNi1 xSn half Heusler合金

DOI:
10.1016/j.jmst.2021.01.052
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发表时间:
2021-03
影响因子:
10.9
通讯作者:
Wang Tongmin
Wang Tongmin
中科院分区:
材料科学1区
文献类型:
--
作者:
Yang Xiong;Liu Daquan;Li Jianbo;Min Ruonan;Kang Huijun;Li Linwei;Chen Zongning;Guo Enyu;Wang Tongmin

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采用自顶向下的方法制备了TiNi 1 +xSn半Heusler合金。采用自顶向下的方法解决了几个棘手的问题,包括杂质相的产生,TiNi2Sn第二相晶粒尺寸的明显差异,以及Seebeck系数(S)、电导率(σ)和热导率(κ)随Ni含量增加的不规则变化。通过自顶向下方法制备的半Heusler(HH)和全Heusler(FH)相之间产生大量非相干界面,显著提高了σ,保留了κ和S,从而导致TiNi1.05Sn样品的无量纲品质因数(ZT)比传统方法制备的样品的ZT提高了约19%。
The top-down method was used to fabricate the TiNi1+xSn half-Heusler alloy. Several knotty problems have been solved using the top-down method, including the generation of impurity phases, the visible discrepancy in the grain size of the TiNi2Sn second phase, and irregular variations in the Seebeck coefficient (S), electrical conductivity (σ), and thermal conductivity (κ) with increasing Ni content. The generation of a large number of incoherent interfaces between the half-Heusler (HH) and full-Heusler (FH) phases fabricated by the top-down method drastically improvedσand retainedκandS, thereby leading to an enhancement in the dimensionless figure of merit (ZT) by ∼19 % for the TiNi1.05Sn sample as compared to the ZT of the samples prepared by the conventional method.
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