萌芽的研究発表論文　　ＭＧおよびＭＡ法による熱電変換材料の高性能化

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タイトル別名
  • High-performance Thermoelectric Materials Prepared by MG or MA Technique.
  • MG オヨビ MAホウ ニ ヨル ネツデンヘンカン ザイリョウ ノ コウセイノウカ

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We have examined the thermoelectric properties of Co1-xFexSb3 ternary system and CoSb3-FeSb2 composite system. The Seebeck coefficient and the electrical resistivity are generallyreduced by the substitution for Co by Fe. The thermal conductivity is also reduced by the substitution especially at high iron content region. These behaviors of the thermoelectric properties in the samples with low iron content are ascribed to the substituted Fe, while those in the samples with high iron content are ascribed to the precipitated FeSb2 (Fe0.73Co0.27Sb2) compound. Co0.75 Fe0.25Sb3 has a maximum value of figure of merit of 4.8×10-4 K-1 at 773K. For the purpose of more reducing of the thermal conductivity, we have prepared the CoSb3-FeSb2 composite where the FeSb2 particles are dispersed in the CoSb3 matrix by MG (mechanical grinding) technique. The thermal conductivity of the composite is smaller than that of Co1-xFexSb3. The electrical resistivity of the composite increases with increasing MG time, but it is smaller than that of CoSb3 at high temperature. The decrease of the thermal conductivity and the less increase of the electrical resistivity are ascribed to the enhancement of the phonon scattering caused by the dispersed FeSb2 in the matrix and the low electrical resistivity of FeSb2, respectively. As a result, the composite whose molar ratio of CoSb3 to FeSb2 is 0.7 to 0.3 and MG time is 25h has a maximum value of figure of merit of 6.1×10-4 K-1 at 756K. This value is larger than the maximum value of 4.8×10-4 K-1 for Co1-xFexSb3 system.

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