Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Thermoelectric Properties of Type-I Ge clathrates containing Sr and Ba

Sr 및 Ba을 포함하는 type-I Ge clathrate 화합물의 열전특성

  • Published : 2006.11.09
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Abstract

Thermoelectric properties of $Sr_8Ga_{16}Ge_{30}$ and $Ba_8Ga_{16}Ge_{30}$ clathrates were investigated in the temperature range between 323K and 923K. Both clathrates were fabricated by the arc-melting method. Homogeneous single phases were observed in the annealed clathrates. Electrical resistivities for both clathrates were increased as the temperature increased up to 823K. The sign of the Seebeck coefficients for both clathrates was negative, which means that the major carriers were electrons. The maximum values of ZT for $Sr_8Ga_{16}Ge_{30}$ and $Ba_8Ga_{16}Ge_{30}$ were 0.86 at 773K and 0.76 at 923K, respectively.

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