Thermoelectric properties of some metal borides |
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Authors: | Masatoshi Takeda Tadahiro Fukuda Ferrer Domingo Takahiro Miura |
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Institution: | Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan |
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Abstract: | Polycrystalline AlMgB14 and some hexaborides (CaB6, SrB6, YbB6, SmB6, and CeB6) were synthesized to examine their thermoelectric properties. Single phase of orthorhombic AlMgB14, which contains B12 icosahedral clusters as building blocks, was obtained at sintering temperatures between 1573 and 1823 K. Seebeck coefficient (α) and electrical conductivity (σ) of the phase were about 500 μV/K and 10−1 1/Ω m at room temperature, respectively. These values are comparable to those of metal-doped β-rhombohedral boron. On the other hand, metal hexaborides with divalent cation possessed large negative α ranging from −100 to −270 μV/K at 1073 K. Calculated power factors of CaB6 and SrB6 exceeded 10−3 W/K2 m within the entire range of temperature measured. As a result, they can be thought as promising candidates for n-type thermoelectric material. |
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Keywords: | AlMgB14 Hexaboride Seebeck coefficient Electrical conductivity Power factor |
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