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<p>Thermoelectric materials have found extensive applications in electro-thermal conversion, leveraging the Peltier and Seebeck effects. Nevertheless, the impact of the Peltier effect during the material preparation process is frequently neglected. This study delves into the non-uniform composition of (Bi, Sb)<sub>2</sub>Te<sub>3</sub> that occurs as a result of the Peltier effect during the plasma-activated sintering (PAS) process. Owing to the Peltier effect, a thermal gradient develops across the opposing extremities of the specimen under PAS conditions. This temperature disparity influences the mass transfer process during PAS and leads to an 8% variance in the Seebeck coefficients of the upper and lower parts of the sample. Although the Peltier effect inherently induces localized thermal gradients during sintering, the homogeneity of the resulting ingots can be significantly improved through optimized raw material preparation coupled with extended sintering durations to mitigate transient temperature fluctuations.</p>

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Combating the Peltier effect in the plasma-activated sintering process of thermoelectric materials by optimizing raw materials and extending the sintering time

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Zhengkai Zhang,
  • Xiaofei Zhang,
  • Zetan Cao,
  • Chengqian Wang

摘要

Thermoelectric materials have found extensive applications in electro-thermal conversion, leveraging the Peltier and Seebeck effects. Nevertheless, the impact of the Peltier effect during the material preparation process is frequently neglected. This study delves into the non-uniform composition of (Bi, Sb)2Te3 that occurs as a result of the Peltier effect during the plasma-activated sintering (PAS) process. Owing to the Peltier effect, a thermal gradient develops across the opposing extremities of the specimen under PAS conditions. This temperature disparity influences the mass transfer process during PAS and leads to an 8% variance in the Seebeck coefficients of the upper and lower parts of the sample. Although the Peltier effect inherently induces localized thermal gradients during sintering, the homogeneity of the resulting ingots can be significantly improved through optimized raw material preparation coupled with extended sintering durations to mitigate transient temperature fluctuations.