Enhanced thermoelectric performance in Ti(Fe, Co, Ni)Sb pseudo-ternary Half-Heusler alloys

Qingmei Wang; Xiaodong Xie; Shan Li; Zongwei Zhang; Xiaofang Li; Honghao Yao; Chen Chen; Feng Cao; Jiehe Sui; Xingjun Liu; Qian Zhang

Journal of Materiomics (Jul 2021)

Enhanced thermoelectric performance in Ti(Fe, Co, Ni)Sb pseudo-ternary Half-Heusler alloys

Qingmei Wang,
Xiaodong Xie,
Shan Li,
Zongwei Zhang,
Xiaofang Li,
Honghao Yao,
Chen Chen,
Feng Cao,
Jiehe Sui,
Xingjun Liu,
Qian Zhang

Affiliations

Qingmei Wang: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Xiaodong Xie: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Shan Li: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Zongwei Zhang: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Xiaofang Li: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Honghao Yao: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Chen Chen: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China
Feng Cao: School of Science, Harbin Institute of Technology, Shenzhen, 518055, China
Jiehe Sui: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
Xingjun Liu: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
Qian Zhang: School of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China; Corresponding author. School of Materials Science and Engineering, and Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, 518055, China.

Journal volume & issue: Vol. 7, no. 4
pp. 756 – 765

Abstract

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TiFe0.5Ni0.5Sb-based half-Heusler compounds have the intrinsic low lattice thermal conductivity and the adjustable band structure. Inspired by the previously reports to achieve both p- and n-type components by tuning the ratio of Fe and Ni based on the same parent TiFe0.5Ni0.5Sb, we selected Co as the amphoteric dopants to prepare both n-type and p-type pseudo-ternary Ti(Fe, Co, Ni)Sb-based half-Heusler alloys. The carrier concentration, as well as the density of states effective mass was significantly increased by Co doping, contributing to the enhanced power factor of 1.80 mW m−1 K−2 for n-type TiFe0.3Co0.2Ni0.5Sb and 2.21 mW m−1 K−2 for p-type TiFe0.5Co0.15Ni0.35Sb at 973 K. Combined with the further decreased lattice thermal conductivity due to the strain field and mass fluctuation scattering induced by alloying Hf on the Ti site, peak ZTs of 0.65 in n-type Ti0.8Hf0.2Fe0.3Co0.2Ni0.5Sb and 0.85 in p-type Ti0.8Hf0.2Fe0.5Co0.15Ni0.35Sb were achieved at 973 K, which is of great significance for the thermoelectric power generation applications.

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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