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Effect of the synthesis methods and process parameters on the thermoelectrics performance of Bi0.5Sb1.5Te3 material were investigated, essential for thermoelectric generators (TEGs). We systematically explore three synthesis techniques: (i) mechanical alloying at 500 RPM (BM500) and 300 RPM (BM300), (ii) melt growth (MG), and (iii) a hybrid approach combining mechanical alloying followed by melt growth (BM500-MG). Positive Seebeck coefficient (α) values confirm p-type conductivity across all methods. The BM500-MG sample achieves the highest power factor (α2σ) of ~6.5 W/m·K2 and a reduced thermal conductivity (κ) of ~1.36 W/mK, resulting in a maximum dimensionless figure-of-merit (zT) of ~1.4 at 300 K. Theoretical, COMSOL simulations based on experimental parameters predict a maximum power output of 250 mW and a conversion efficiency (η) ~ 12% for MG-BM500 sample.

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Effect of Synthesis Strategy on the Thermoelectric Properties of Bi0.5Sb1.5Te3

  • 会议论文

  • 发表日期：

    2025年

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  • Ranu Bhatt,
  • Rishikesh Kumar,
  • Shovit Bhattacharya,
  • Ajay Singh

摘要

Effect of the synthesis methods and process parameters on the thermoelectrics performance of Bi0.5Sb1.5Te3 material were investigated, essential for thermoelectric generators (TEGs). We systematically explore three synthesis techniques: (i) mechanical alloying at 500 RPM (BM500) and 300 RPM (BM300), (ii) melt growth (MG), and (iii) a hybrid approach combining mechanical alloying followed by melt growth (BM500-MG). Positive Seebeck coefficient (α) values confirm p-type conductivity across all methods. The BM500-MG sample achieves the highest power factor (α2σ) of ~6.5 W/m·K2 and a reduced thermal conductivity (κ) of ~1.36 W/mK, resulting in a maximum dimensionless figure-of-merit (zT) of ~1.4 at 300 K. Theoretical, COMSOL simulations based on experimental parameters predict a maximum power output of 250 mW and a conversion efficiency (η) ~ 12% for MG-BM500 sample.