Materials Transactions Online

Materials Transactions, Vol.43 No.7 (2002) pp.1719-1723
© 2002 The Japan Institute of Metals

Thermoelectric Properties of Hot-pressed Boron Suboxide (B6O)

Takaya Akashi, Tsuyoshi Itoh*, Itaru Gunjishima**, Hiroshi Masumoto and Takashi Goto

Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Boron suboxide (B6O) sintered bodies were prepared by a solid state reaction and a hot pressing method. The thermoelectric properties of B6O were compared with those of B4C. The electrical conductivity was smaller than that of B4C, and the Seebeck coefficient was twice as large as that of B4C indicating p-type conduction. The hopping conduction of electronic charge carriers was suggested from the temperature dependencies of the electrical conductivity and mobility. The thermal conductivity was greater than that of B4C. The thermoelectric dimension-less figure-of-merit increased with increasing temperature, and was 0.62× 10-3 at 1000 K. This value was almost in agreement with that of B4C.

(Received March 11, 2002; Accepted May 27, 2002)

Keywords: boron suboxide, ichosahedral structure, thermoelectric property, Seebeck coefficient, electrical conductivity, thermal conductivity


*Graduate Student, Tohoku University, Present address: Honda R&D Co., Ltd.
**Graduate Student, Tohoku University, Present address: Toyota Central R&D Labs., Inc.

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