Interconnection of iron disilicide crystal structure parameters with its thermoelectric properties

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI:10.1109/ICT.2001.979871

M. Fedorov, V. Zaitsev, I. Eremin, N. F. Kartenko, P. Konstantinov, V. Popov, M. Kurisu, G. Nakamoto, T. Souma

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引用次数: 2

Abstract

The paper is devoted to the study of transport properties of the semiconductor phase of iron disilicide (/spl beta/-FeSi/sub 2/) at low temperature. A previous study of kinetic properties of /spl beta/-FeSi/sub 2/ showed that there is a very large difference in the thermoelectric properties of a number of samples of the same composition prepared by the same method. No essential difference was found between electrical conductivity at low temperature of single crystals and that of polycrystalline samples of iron disilicide. This paper shows that the smaller the lattice parameters of the sample, the smaller is its electrical conductivity at /spl sim/10 K. It is shown that the smallest electrical conductivity at this temperature corresponds to the unit cell of stoichiometric /spl beta/-FeSi/sub 2/, or a slightly smaller unit cell than the stoichiometric one. The study of specific heat and magnetic susceptibility of /spl beta/-FeSi/sub 2/ at low temperature indicates no phase transition or magnetic ordering at T = 20-25 K corresponding to the break in temperature dependence of electrical conductivity.

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二硅化铁晶体结构参数与其热电性能的相互关系

本文研究了二硅化铁半导体相(/spl β /-FeSi/sub 2/)在低温下的输运性质。前人对/spl β /-FeSi/sub 2/的动力学性质的研究表明，用相同的方法制备的相同成分的许多样品的热电性质有很大的差异。二硅化铁的单晶低温电导率与多晶样品的低温电导率无本质差异。结果表明，样品的晶格参数越小，其在/spl sim/10 K下的电导率越小。结果表明，在该温度下，最小的电导率对应于化学计量/spl β /-FeSi/sub 2/的单位电池，或者比化学计量单位电池略小。对/spl β /-FeSi/sub 2/的低温比热和磁化率的研究表明，在T = 20-25 K时，电导率的温度依赖性被打破，没有发生相变或磁有序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)

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