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

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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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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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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).

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