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Simple Synthesis and Thermoelectric Properties of Mg2 + xSi0.5Sn0.5Sb0.075 Materials with Heterogeneous Microstructure

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Abstract

Mg2X (X = Si, Ge or Sn) based alloys are considered as promising candidates in the middle to high temperature range thermoelectric applications due to their low cost, nontoxicity and abundance of constituent elements. However, they exhibit relatively higher thermal conductivity compared to other thermoelectric materials. In this study, we present a simple synthetic method for a Mg2 + xSi0.5Sn0.5Sb0.075 material with a heterogeneous microstructure that reduces thermal conductivity. By controlling the amount of excess Mg during synthesis, a heterogeneous microstructure due to the formation of secondary phases was obtained. This heterogeneous microstructure reduced the thermal conductivity through phonon scattering, leading to an improved thermoelectric efficiency, particularly at high temperatures.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (No. 2021R1A2C1011317) and by Chonnam National University (Grant number: 2022–2906).

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Authors and Affiliations

  1. Energy Conversion Research Center, Korea Electrotechnology Research Institute, Changwon, 51543, South Korea

    Jeongin Jang, Bok-Ki Min, Bong-Seo Kim & Sung-Jae Joo

  2. School of Chemical Engineering, Chonnam National University, Gwangju, 61186, South Korea

    Yong Il Park & Ji Eun Lee

Authors
  1. Jeongin Jang
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  2. Bok-Ki Min
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  3. Bong-Seo Kim
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  4. Sung-Jae Joo
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Correspondence to Yong Il Park or Ji Eun Lee.

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Jang, J., Min, BK., Kim, BS. et al. Simple Synthesis and Thermoelectric Properties of Mg2 + xSi0.5Sn0.5Sb0.075 Materials with Heterogeneous Microstructure. Korean J. Chem. Eng. 41, 533–538 (2024). https://doi.org/10.1007/s11814-024-00105-5

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  • DOI: https://doi.org/10.1007/s11814-024-00105-5

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