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This article is cited in 5 scientific papers (total in 5 papers)
Semiconductors
Morphology and the thermoelectric properties of $\gamma$-Gd$_{x}$Dy$_{1-x}$S$_{1.5-y}$ solid solution ceramics
Sotnikov A.Va, V. V. Bakovetsa, Michihiro Ohtab, A. Sh. Agazhanovc, S. V. Stankusc a Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
b Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST),
1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
c S.S. Kutateladze Institute of Thermophysics, Siberian Division of the Russian Academy of Sciences
Abstract:
The temperature dependences of the Seebeck coefficient, the electrical conductivity (T = 300–873 K) and also the heat conductivity coefficient, and the thermoelectric figure of merit ($T$ = 300–770 K) of polycrystalline samples of solid solutions based on gadolinium and dysprosium sulfides of compositions $\gamma$-Gd$_{x}$Dy$_{1-x}$S$_{1.49}$ ($x$ = 0.1, 0.2, 0.3, 0.4) have been studied. It is found that the morphological features of the samples, namely, specifically of the crystallite surface that causes a change in the number of the deformation centers, determines the thermal conductivity of $\gamma$-Gd$_{x}$Dy$_{1-x}$S$_{1.49}$ solid solutions; the thermal conductivity of the composition with $x$ = 0.2 is found to decrease anomalously. For this composition, the lowest values of the Seebeck coefficient –371 $\mu$V/K at 873 K, resistivity 880 $\mu\Omega$ m at 873 K, and the thermal conductivity coefficient 0.68 $\pm$ 0.03 W/m K at 770 K have been obtained; in this case, the thermoelectric figure of merit achieves the value $ZT$ = 0.23.
Keywords:
REE sulfides, solid solutions, real structure, thermoelectric properties.
Received: 12.11.2019 Revised: 12.11.2019 Accepted: 25.11.2019
Citation:
Sotnikov A.V, V. V. Bakovets, Michihiro Ohta, A. Sh. Agazhanov, S. V. Stankus, “Morphology and the thermoelectric properties of $\gamma$-Gd$_{x}$Dy$_{1-x}$S$_{1.5-y}$ solid solution ceramics”, Fizika Tverdogo Tela, 62:4 (2020), 537–546; Phys. Solid State, 62:4 (2020), 611–620
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https://www.mathnet.ru/eng/ftt8445 https://www.mathnet.ru/eng/ftt/v62/i4/p537
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