Discovery of YbNiSb-Based Half-Heusler Alloys as Promising Thermoelectric Materials
Discovery of YbNiSb-Based Half-Heusler Alloys as Promising Thermoelectric Materials
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发现 YbNiSb 基 Half-Heusler 合金作为有前途的热电材料
DOI:
10.1021/acsaem.2c02269
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发表时间:
2022-10
影响因子:
6.4
通讯作者:
Chenyang Wang
中科院分区:
文献类型:
--
作者:
Jiamian Huang;Rongtao Liu;Quanying Ma;Zuojian Jiang;Yibin Jiang;Yu Li;Chenyang Wang
Half-Heusler materials are promising candidates for high-temperature power generation and have relatively high lattice thermal conductivity compared to other thermoelectric material systems. In this work, we report novel p-type YbNiSb-based half-Heusler alloys with a low lattice thermal conductivity (∼3.6 W m–1K–1at 340 K) that resulted from their large Grüneisen parameter, low sound speed, and low Debye temperature. All YbNiSb-based alloys exhibit a high carrier mobility of 30–50 cm2V–1s–1at room temperature because of their relatively small effective mass. Importantly, the structural analysis reveals that Yb-rich Yb1.3Ni0.9Sb0.8exhibits Yb/Ni and Yb/Sb substitution, indicating a wide homogeneity region of the YbNiSb phase experimentally. The adjustable Yb and Ni contents in YbNiSb-based alloys can modify the band structure around the Fermi level and significantly affect electrical transport properties. Additionally, by doping Ta at Yb sites, the carrier concentration and lattice thermal conductivity of these alloys can be manipulated. Consequently, a peakzTvalue of 0.45 at 823 K was achieved for Yb0.95Ta0.05NiSb. Our work demonstrates that YbNiSb-based alloys are promising p-type thermoelectric materials and suggests the possibility of exploring novel thermoelectric alloys in rare-earth nickel pnictides via tuning their composition and crystal structure.
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