Abstract
A rapid solidification and spark plasma sintering technique was applied to fabricate Bi-Sb-Te bulk thermoelectric materials. Although the grain boundaries in sintered samples were primarily composed of large-angle boundaries, a large fraction of small-angle boundaries was found at a high sintering temperature. As the sintering temperature increased, the Seebeck coefficient was almost unchanged while the electrical resistivity gradually decreased. The thermal conductivity gently increased till 420°C, and then abruptly increased. As a result, the largest ZT value of 1.1 was achieved for the sample sintered at 400°C, which is increased by 44.7% compared with that prepared from mechanically alloyed powders.
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