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Research Article | Open Access

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSrxCoOδ (0 ≤ x ≤ 1)

M. A. BOUSNINAaR. DUJARDINaL. PERRIEREbF. GIOVANNELLIaG. GUEGANcF. DELORMEa( )
Université François Rabelais de Tours, CNRS, INSA CVL, GREMAN UMR7347, IUT de Blois, 15 rue de la chocolaterie, CS2903, F-41029 Blois Cedex, France
ICMPE, 2-8 Rue Henri Dunant, 94320 Thiais, France
ST Microelectronics, 16 Rue Pierre et Marie Curie, 37100 Tours, France
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Abstract

In this work, we synthesized cubic perovskite ceramics of the whole La1–xSrxCoO3 (0 ≤ x ≤ 1) solid solution for the first time. Synthesis was carried out by solid state reaction and conventional sintering to reach dense ceramics. For x > 0.8, it was necessary to substitute 3% cobalt by silicon to stabilize the cubic perovskite structure. Electrical conductivity increased with Sr content to reach 3×105 S·m–1 at 330 K for x = 0.3. However, the optimum electrical properties have been found for x = 0.05 at 330 K with PFmax = 3.11×10–4 W·m–1·K–2. Indeed, the Seebeck coefficient was decreasing when x increased to reach values close to 0 for x ≥ 0.3. Thermal conductivity was low at low temperature (≈ 2.5 W·m–1·K–1) and increased up to 6.5 W·m–1·K–1 when temperature increased. As the highest power factor was reached at low temperature as well as the lowest thermal conductivity, La1–xSrxCoO3 compounds with low x values appeared as very promising thermoelectric materials around room temperature, on the contrary to layered cobalt oxides. For high x values, Seebeck coefficient values close to zero made these materials unsuitable for thermoelectric applications.

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Journal of Advanced Ceramics
Pages 160-168
Cite this article:
BOUSNINA MA, DUJARDIN R, PERRIERE L, et al. Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSrxCoOδ (0 ≤ x ≤ 1). Journal of Advanced Ceramics, 2018, 7(2): 160-168. https://doi.org/10.1007/s40145-018-0267-3

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Received: 21 December 2017
Revised: 05 March 2018
Accepted: 09 March 2018
Published: 28 March 2018
© The author(s) 2018

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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