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Simple Synthesis and Thermoelectric Properties of Mg 2 + x Si 0.5 Sn 0.5 Sb 0.075 Materials with Heterogeneous Microstructure
Abstract
Mg 2 X (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 Mg 2 + x Si 0.5 Sn 0.5 Sb 0.075 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 effi ciency, particularly at high temperatures.
