【摘 要】
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T.Y.Ou-Yang等人借助电阻、塞贝克系数及热导率等测量方法,研究钴置换对FeSi晶体热电性能的影响。测量结果发现,Fe_(1-x)Co_xSi化合物中x=0.3时,由于Fe-Si能带隙闭塞,出现金
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T.Y.Ou-Yang等人借助电阻、塞贝克系数及热导率等测量方法,研究钴置换对FeSi晶体热电性能的影响。测量结果发现,Fe_(1-x)Co_xSi化合物中x=0.3时,由于Fe-Si能带隙闭塞,出现金属→绝缘体转变,化合物的塞贝克系数变化明显,可以认为是Fe_(1-x)Co_xSi化合物不对称电子带结构造成的。导热性测试表明,由于Co置换,晶界散射和点缺陷散射强烈影响Fe-Si声子的低温热传导。最令人注意的是,最佳Co置换量的
T.Y.Ou-Yang et al. Investigated the effects of cobalt substitution on the thermoelectric properties of FeSi crystals by means of measurement of resistance, Seebeck coefficient and thermal conductivity. The results show that the Seebeck coefficient of the compound changes obviously due to the bandgap of Fe-Si occured and the transition of metal → insulator occurs when x = 0.3 in the Fe 1-x Co x Si compound, which can be considered as Fe 1-x. Co_xSi compounds asymmetric electronic structure caused by the band. Thermal conductivity tests show that due to Co substitution, grain boundary scattering and point-defect scattering strongly influence the low-temperature heat conduction of Fe-Si phonons. Most notably, the best Co displacement
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