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Figure of merit enhancement in thermoelectric materialsbased on γ-Ln0.8 Yb 0.2 S1.5-y (Ln = Gd, Dy) solid solutions Full article

Journal Journal of the American Ceramic Society
ISSN: 0002-7820 , E-ISSN: 1551-2916
Output data Year: 2022, Volume: 105, Number: 4, Pages: 2813-2822 Pages count : 10 DOI: 10.1111/jace.18292
Tags rare earth, solid solutions, sulfides, thermal properties, thermoelectric properties
Authors Sotnikov A.V. 1 , Syrokvashin M.M. 1 , Bakovets V.V. 1 , Filatova I.Yu. 1 , Korotaev E.V. 1 , Agazhanov A.Sh. 2 , Samoshkin D.A. 2
Affiliations
1 Nikolaev Institute of InorganicChemistry, Siberian Branch, RussianAcademy of Sciences, Novosibirsk, Russia
2 Kutateladze Institute of Thermophysics,Siberian Branch, Russian Academy ofSciences, Novosibirsk, Russia

Abstract: Here we report the study temperature dependencies of the Seebeck coefficient,the electrical resistivity (T = 300–750 K), the total thermal conductivity (T = 300–973 K), and the thermoelectric figure of merit (T = 300–750 K) of ceramic sam-ples of γ-Ln 0.8 Yb 0.2 S 1.5-y (Ln = Gd, Dy) solid solutions. It was found that Yb 3+ions in γ-Ln 0.8 Yb 0.2 S 1.5-y act as the promoters of higher crystallite nucleation rateduring the formation of solid solutions. This results in the sample dispersionincrease and the formation of the additional phonon scattering centers (disloca-tions and strain stresses along the crystallites semi-coherent boundaries). Thesefeatures of the real structure determined the low value of thermal conductivity ofγ-Ln 0.8 Yb 0.2 S 1.5-y solid solutions. The lowest electrical resistivity 20 μΩ m at 750K and the thermal conductivity 0.58 W/m K at 973 K, the highest Seebeck coeffi-cient 125 μV/K at 700 K and the maximum thermoelectric efficiency, ZT = 0.60(at 770 K) were obtained for γ-Dy 0.8 Yb 0.2 S 1.5-y.
Cite: Sotnikov A.V. , Syrokvashin M.M. , Bakovets V.V. , Filatova I.Y. , Korotaev E.V. , Agazhanov A.S. , Samoshkin D.A.
Figure of merit enhancement in thermoelectric materialsbased on γ-Ln0.8 Yb 0.2 S1.5-y (Ln = Gd, Dy) solid solutions
Journal of the American Ceramic Society. 2022. V.105. N4. P.2813-2822. DOI: 10.1111/jace.18292 WOS Scopus РИНЦ OpenAlex
Identifiers:
Web of science: WOS:000734331000001
Scopus: 2-s2.0-85121759551
Elibrary: 47545933
OpenAlex: W4200207665
Citing:
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OpenAlex 8
Web of science 7
Scopus 7
Elibrary 4
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