Estimation of the band gap of a series of new thermoelectric materials


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Resumo

The band gap Eg of a number of new thermoelectric materials, such as skutterudites, clathrates, Heusler phases, (Ge,Sn,Pb)(Te,Se)]m[(Bi,Sb)2(Te,Se)3]n (m, n = 0, 1, 2…) ternary alloys, and others is estimated. Estimations are performed using Goldsmid-Sharp’s formula Eg = 2emax|Tmax, Vegard’s rule Eg = (mEgA + nEgB)/(m + n), and the empirical dependence Tmax = f(Eg) (A and B denote the corresponding binary alloys, Tmax is the temperature corresponding to the thermoelectric-power maximum |αmax| or the thermoelectric figure of merit (ZT)max, and e is the elementary charge). It is shown that the empirical dependence Eg = f(Tmax) gives the most accurate estimates of Eg for difference classes of thermoelectric materials.

Sobre autores

M. Kretova

Baikov Institute of Metallurgy and Material Science

Autor responsável pela correspondência
Email: kretova@imet.ac.ru
Rússia, Moscow, 119334

M. Korzhuev

Baikov Institute of Metallurgy and Material Science

Email: kretova@imet.ac.ru
Rússia, Moscow, 119334

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