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Thermal hysteresis behaviors of thermoelectric properties

机译:热电性能的热滞行为

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摘要

Thermoelectric behaviors for the thermal cycles between room and high temperatures are investigated in (Bi,Sb)_2 Te_3 and Bi_2S_3. Because the reliability and reproducibility of the data against repeated heating are required, the Harman method is adopted to evaluate the figure of merit, ZT, in which only electrical contacts are needed. The electrical contacts are made by the spot welding method using a simple and low-power machine made in our laboratory to avoid damage to the samples. Thermoelectric properties are changed by repeating thermal cycles, though their rate of change is not always very high and is material dependent. The carrier number dominantly contributes to the thermal hysteresis of the thermoelectric properties upon the repetition of the thermal cycles, which actually affects the sample as an annealing effect. It is pointed out that changes in thermoelectric properties upon the repetition of the thermal cycles should be examined beforehand in practical applications.
机译:在(Bi,Sb)_2 Te_3和Bi_2S_3中研究了室温和高温之间的热循环的热电行为。由于需要数据针对反复加热的可靠性和可重复性,因此采用Harman方法评估仅需要电接触的品质因数ZT。电气触点采用我们实验室制造的简单低功耗机器通过点焊方法制成,以避免损坏样品。通过重复热循环来改变热电特性,尽管它们的变化率并不总是很高并且取决于材料。载流子数目在重复热循环时主要有助于热电特性的热滞后,实际上,其作为退火效应影响样品。需要指出的是,在实际应用中,应事先检查热循环重复进行时热电性能的变化。

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  • 来源
    《Japanese journal of applied physics》 |2014年第12期|125502.1-125502.6|共6页
  • 作者

    Hideo Iwasaki;

  • 作者单位

    Center for Nano Materials Technology, JAIST, Nomi, Ishikawa 923-1292, Japan;

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  • 正文语种 eng
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