Phase Boundary Mapping in ZrNiSn Half-Heusler for Enhanced Thermoelectric Performance
Xiaofang Li,
Pengbo Yang,
Yumei Wang,
Zongwei Zhang,
Dandan Qin,
Wenhua Xue,
Chen Chen,
Yifang Huang,
Xiaodong Xie,
Xinyu Wang,
Mujin Yang,
Cuiping Wang,
Feng Cao,
Jiehe Sui,
Xingjun Liu,
Qian Zhang
Affiliations
Xiaofang Li
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Pengbo Yang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Yumei Wang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Zongwei Zhang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Dandan Qin
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Wenhua Xue
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Chen Chen
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Yifang Huang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Xiaodong Xie
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Xinyu Wang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Mujin Yang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Cuiping Wang
Department of Materials Science and Engineering, Xiamen University, Xiamen, Fujian 361005, China
Feng Cao
Department of Science, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
Jiehe Sui
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Xingjun Liu
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Qian Zhang
Department of Materials Science and Engineering, Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
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 ZT value~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.
