Thermoelectric properties of intermetallic compounds:: Mg3Bi2 and Mg3Sb2 for medium temperature range thermoelectric elements

被引：46

作者：

Kajikawa, T ^{[1
]}

Kimura, N ^{[1
]}

Yokoyama, T ^{[1
]}

机构：

[1] Shonan Inst Technol, Fujisawa, Kanagawa 2518511, Japan

来源：

TWENTY-SECOND INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT '03 | 2003年

关键词：

D O I：

10.1109/ICT.2003.1287510

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Hot-press sintered thermoelectric elements of intermetallic compounds: Mg3Bi2 and Mg3Sb2 were examined for the feasibility as medium temperature range thermoelectric elements, which belong to the family of zinc blend crystal structure. The experiments were carried out varying the sintering temperature in order to find out the optimum morphology for the sintered material system, because the thermoelectric performance was affected with the macro- and micro-structure due to the sintering process. Seebeck coefficients (S), electrical conductivity (a) and thermal conductivity (kappa) were measured in the temperature range from 300K to 773K. According to the Seebeck coefficient measurement, both materials were p-type semiconductor. As the results, the power factor (=S(2)sigma,) could be obtained from 1.0 x 10(-3) W/m(2)K at 550K to 2.5 x 10(-3) W/m(2)K at 773K for Mg3Bi2 system and from 1.0 x 10(-3) W/m(2)K at 600K to 2.0 x 10(-3) W/m(2)K at 740K for Mg3Sb2 system respectively. The measurement of thermal conductivity by laser flash method showed that the hotpress sintered Mg3Sb2 element had the relatively low thermal conductivity. The estimate for Mg3Sb2 elements promisingly shows the dimensionless figure of merit ZT of 0.55 at 660K.

引用

页码：305 / 308

页数：4

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