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

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Web of science:	WOS:000734331000001
Scopus:	2-s2.0-85121759551
Elibrary:	47545933
OpenAlex:	W4200207665

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