Phase Boundary Mapping in ZrNiSn Half-Heusler for Enhanced Thermoelectric Performance

Author:

Li Xiaofang1,Yang Pengbo1,Wang Yumei2,Zhang Zongwei1,Qin Dandan3,Xue Wenhua2,Chen Chen1,Huang Yifang1,Xie Xiaodong1,Wang Xinyu1,Yang Mujin1,Wang Cuiping4,Cao Feng5,Sui Jiehe3,Liu Xingjun13,Zhang Qian1ORCID

Affiliation:

1. Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China

2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China

4. Department of Materials Science and Engineering, Xiamen University, Xiamen, Fujian 361005, China

5. Department of Science, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China

Abstract

The solubility range of interstitial Ni in the ZrNi1+xSn half-Heusler phase is a controversial issue, but it has an impact on the thermoelectric properties. In this study, two isothermal section phase diagrams of the Zr-Ni-Sn ternary system at 973 K and 1173 K were experimentally constructed based on the binary phase diagrams of Zr-Ni, Zr-Sn, and Ni-Sn. The thermodynamic equilibrium phases were obtained after a long time of heating treatment on the raw alloys prepared by levitation melting. Solubilities of x<0.07 at 973 K and x<0.13 at 1173 K were clearly indicated. An intermediate-Heusler phase with a partly filled Ni void was observed, which is believed to be beneficial to the lowered lattice thermal conductivity. The highest ZTvalue~0.71 at 973 K was obtained for ZrNi1.11Sn1.04. The phase boundary mapping provides an important instruction for the further optimization of ZrNiSn-based materials and other systems.

Funder

Shenzhen Science and Technology Innovation Plan

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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