Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (7): 724-730.DOI: 10.15541/jim20210631

Special Issue: 【能源环境】热电材料

• RESEARCH ARTICLE • Previous Articles     Next Articles

Thermoelectric Property of In2O3/InNbO4 Composites

CHENG Cheng(), LI Jianbo, TIAN Zhen, WANG Pengjiang, KANG Huijun(), WANG Tongmin   

  1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2021-10-11 Revised:2021-11-19 Published:2022-07-20 Online:2021-12-02
  • Contact: KANG Huijun, professor. E-mail:
  • About author:CHENG Cheng (1996-), male, Master candidate. E-mail:
  • Supported by:
    National Natural Science Foundation of China(51971052);National Natural Science Foundation of China(51774065);National Key Research and Development Program of China(2017YFA0403803);Liaoning Revitalization Talents Program(XLYC2007183);Liaoning Revitalization Talents Program(XLYC1808005);Innovation Foundation of Science and Technology of Dalian(2020JJ25CY002);Innovation Foundation of Science and Technology of Dalian(2020JJ26GX045)


As being a good photoelectric and gas sensitive material, In2O3 is of great interest to the thermoelectric community due to its excellent thermoelectric properties at high temperature. In this study, the second phase InNbO4 was successfully induced into the In2O3 matrix in situ by solid-state reaction combined with spark plasma sintering (SPS) to optimize the preparation process of bulk samples. It is found that introducing InNbO4 distinctly affects the electrical transport properties of the In2O3/InNbO4 composite samples, and its carrier concentration is dramatically increased. The highest electrical conductivity is 1548 S·cm-1 at 1023 K, which is higher than those of most element-doped samples. The power factor of 0.67 mW·m-1·K-2 and the highest ZT value of 0.187 are achieved for the 0.998In2O3/0.002InNbO4 sample at 1023 K. In conclusion, the electrical properties of In2O3 ceramics can be effectively improved by introducing in-situ InNbO4 second phase, and thus the thermoelectric property at high temperatures is further regulated.

Key words: thermoelectric materials, In2O3, InNbO4, thermoelectric property at high temperature

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