マグネシウム珪化物焼結体素子の熱電特性

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  • Thermoelectric Properties of Sintered Magnesium Silicides
  • マグネシウム ケイカブツ ショウケツタイ ソシ ノ ネツデン トクセイ

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Thermoelectric properties of n-type sintered magnesium silicides are investigated aiming the development of a thermoelectric power generation system using waste heat such as combustion heat of municlpal solid waste. The samples are sintered with a shrinking rate control sintering method to keep each grain size small. Temperature dependencies of thermoelectric properties such as Seebeck coefficient, electrical resistivity and power factor are measured for the temperature range from 300K to 770K. The samples are also analyzed with SEM and powder X-ray diffraction method (XRD). It is clarified that the sintered magnesium silicides can be promisingly used as thermoelectric element for the middle temperature range around 700K. On the basis of the thermal conductivity measurement by laser flash method at room temperature and power factor measurement the non-dimensional figure of merit ZT can be estimated about 0.4 at 600K.

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