Thermoelectric Property and p-n Transition Mechanism of Hot Pressed Bi4/3Sb2/3Te3

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J. Korean Ceram. Soc. > Volume 29(11); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(11): 855.

$Bi_{4/3}Sb_{2/3}Te_3$ 가압소결체의 열전특성과 p-n 전이기구

박태호, 유한일¹, 심재동¹

서울대학교 무기재료공학과
¹한국과학기술연구원 금속재료공정연구실

Thermoelectric Property and p-n Transition Mechanism of Hot Pressed Bi4/3Sb2/3Te3

ABSTRACT

Thermoelectric power, electrical conductivity and Hall effect were measured, as functions of temperature in the range of 100 to 600 K, on polycrystalline Bi4/3Sb2/3Te3 which had been prepared via uniaxial hot-pressing at different temperatures in the range of 373 K to 773 K, aiming at searching a profitable processing route to a polycrystalline thermoelectric material, a promising, viable alternative to a single crystalline one. It was found that, with increasing temperature of pressing under a fixed pressure, the material, normally a p-type prior to being hot-pressed, underwent a transition to n-type. This transition was confirmed to be due to plastic deformation during hot-pressing and interpreted as being attributed to the change of the major ionic defect BiTe' into TeBi˙at temperature high enough for structure elements mobility. Thermoelectric figure-of-merit of the hot-pressed material was discussed in connection with the p-n transition in addition to microstructure.