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Morphology and the Thermoelectric Properties of γ-GdxDy1 – xS1.5 – y Solid Solution Ceramics

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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 γ‑GdxDy1 – xS1.49 (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 γ-GdxDy1 – xS1.49 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 μV/K at 873 K, resistivity 880 μΩ m at 873 K, and the thermal conductivity coefficient 0.68 ± 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.

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ACKNOWLEDGMENTS

The authors thank D.P. Pishchur and N. Fujimoto for the measurements of thermoelectric properties, E.V. Korotaev for conducting measurements of magnetic properties and I.Yu. Filatova and for helping with the synthesis of solid solutions of rare-earth sulfides.

Funding

This work was performed in the framework of the state task to Nikolaev Institute of Inorganic Chemistry of Siberian Branch of the Russian Academy of Sciences NIIC SB RAS in the field of fundamental research. The measurements of the thermal diffusivity were performed in the framework of the state task to IT SB RAS (project no. AAAA-A17-117022850029-9).

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    A. V. Sotnikov & V. V. Bakovets

  2. Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1Umezono, 305-8568, Tsukuba, Ibaraki, Japan

    Michihiro Ohta

  3. Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    A. Sh. Agazhanov & S. V. Stankus

Authors
  1. A. V. Sotnikov
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  2. V. V. Bakovets
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  3. Michihiro Ohta
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  4. A. Sh. Agazhanov
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  5. S. V. Stankus
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Correspondence to A. V. Sotnikov.

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Translated by Yu. Ryzhkov

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Sotnikov, A.V., Bakovets, V.V., Ohta, M. et al. Morphology and the Thermoelectric Properties of γ-GdxDy1 – xS1.5 – y Solid Solution Ceramics. Phys. Solid State 62, 611–620 (2020). https://doi.org/10.1134/S1063783420040216

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  • DOI: https://doi.org/10.1134/S1063783420040216

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