【摘要】 采用悬浮熔炼法制备了Fe-Sm-Si热电合金材料,并研究了其电学输运特性。实验表明:在Fe1-xSmxSi2合金中,Sm为n型掺杂元素,Sm轻掺杂时,试样仍为p型,随着Sm量的增加,试样的Seebeck系数和功率因子都降低;Sm含量x 0.4的高Sm硅化物试样为n型,其中,热电性能最好的试样成分为Fe0.6Sm0.4Si2,其电阻率在10-5W穖数量级,而Seebeck系数仍达到80 mV稫-1左右。其机理被认为是由于Sm的4f层电子的贡献。更多还原

【Abstract】 Iron samarium silicide (Fe-Sm-Si) thermoelectric alloys have been prepared by vacuum levitation melting and their electric transport properties were studied. It was found that Sm is an n-type dopant in the Fe1-xSmxSi2 alloys. Both the Seebeck coefficient and the power factor of p-type samples lightly doped with Sm decrease with increasing Sm dopant level. High samarium silicides with x 0.4 are n-type alloys. The sample with the best thermoelectric properties in the present work has a composition of Fe0.6Sm0.4Si2, with a low electric resistivity of about 10-5W穖 and a satisfactory Seebeck coefficient of about 80mV稫-1 due to the contribution of the 4f-electrons of Sm.更多还原