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5 papers
XV International Conference ''Thermoelectrics and Their Applications-2016 St. Petersburg'', November 15-16, 2016
Estimation of the band gap of a series of new thermoelectric materials
M. A. Kretova,
M. A. Korzhuev Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
Abstract:
The band gap
$E_{g}$ 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
$\dots$) ternary alloys, and others is estimated. Estimations are performed using Goldsmid–Sharp's formula $E_{g}=2e|\alpha_{\operatorname{max}}|T_{\operatorname{max}}$, Vegard’s rule $E_{g}=(mE_{g}^{\operatorname{A}}+nE_{g}^{\operatorname{B}})/(m+n)$, and the empirical dependence
$T_{\operatorname{max}}=f(E_{g})$ (A and B denote the corresponding binary alloys,
$T_{\operatorname{max}}$ is the temperature corresponding to the thermoelectric-power maximum
$|\alpha_{\operatorname{max}}|$ or the thermoelectric figure of merit
$(ZT)_{\operatorname{max}}$, and
$e$ is the elementary charge). It is shown that the empirical dependence
$E_{g}=f(T_{\operatorname{max}})$ gives the most accurate estimates of
$E_{g}$ for difference classes of thermoelectric materials.
Received: 27.12.2016
Accepted: 12.01.2017
DOI:
10.21883/FTP.2017.07.44648.34
Fulltext:
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