Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Optimized Thermoelectric Properties in Zn-doped Zintl Phase Magnesium-Antimonide

  • Rahman, Md. Mahmudur (Dept. of Material Sci. and Eng., Research Center for Sustainable Eco-Devices and Materials (ReSEM), Korea National University of Transportation) ;
  • Ur, Soon-Chul (Dept. of Material Sci. and Eng., Research Center for Sustainable Eco-Devices and Materials (ReSEM), Korea National University of Transportation)
  • Received : 2022.04.13
  • Accepted : 2022.05.30
  • Published : 2022.06.27
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Abstract

Magnesium-antimonide is a well-known zintl phase thermoelectric material with low band gap energy, earth-abundance and characteristic electron-crystal phonon-glass properties. The nominal composition Mg3.8-xZnxSb2 (0.00 ≤ x ≤ 0.02) was synthesized by controlled melting and subsequent vacuum hot pressing method. To investigate phase development and surface morphology during the process, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were carried out. It should be noted that an additional 16 at. % Mg must be added to the system to compensate for Mg loss during the melting process. This study evaluated the thermoelectric properties of the material in terms of Seebeck coefficient, electrical conductivity and thermal conductivity from the low to high temperature regime. The results demonstrated that substituting Zn at Mg sites increased electrical conductivity without significantly affecting the Seebeck coefficient. The maximal dimensionless figure of merit achieved was 0.30 for x = 0.01 at 855 K which is 30% greater than the intrinsic value. Electronic flow properties were also evaluated and discussed to explain the carrier transport mechanism involved in the thermoelectric properties of this alloy system.

Keywords

Acknowledgement

This research was supported by the Korea Basic Science Institute grant funded by the Ministry of Education (grant no. 2019R1A6C1010047).

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