ホットプレス法によるBi-Te系熱電材料の電気的及び機械的特性

概要

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The purpose of this work is to present thermoelectric and mechanical properties of Bi-Te polycrystalline materials. Semiconducting ceramics of p- and n-type bismuth telluride were prepared by a hot press method. High purity row materials of Bi, Sb, Te and Se were used for the alloy preparation and the sample with a dimension of 144 mm in diameter and 35 mm in hight was obtained. The tensile and compressive strengths of n-type were 20.6 and 118 MPa, respectively, being independent of hot press directions. A thermomechanical analysis (TMA) was used to determine the thermal expansion coefficient of 1.59 × 10^<-5>K^<-1> for n-type and 1.69 × 10^<-5>K^<-1> for p-type. The thermal expansion coefficient was denpendent on the hot press direction. The thermoelectric modules were fabricated to determine their figure of merit of 2.3 × 10^<-3>K^<-1> at 20℃. From the present observations, the polycrystalline bismuth telluride was found to have the same thermoelectric properties as zone-melting ones.
社団法人日本セラミックス協会の論文
1997-02-01