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      Synthesis, sintering, and thermoelectric properties of the solid solution La 1– x Sr x CoO δ (0 ≤ x ≤ 1)

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          Abstract

          In this work, we synthesized cubic perovskite ceramics of the whole La 1– x Sr x CoO 3 (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 3×10 5 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 PF max = 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, La 1– x Sr x CoO 3 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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          Author and article information

          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 June 2018
          : 07
          : 02
          : 160-168 (pp. )
          Affiliations
          aUniversité François Rabelais de Tours, CNRS, INSA CVL, GREMAN UMR7347, IUT de Blois, 15 rue de la chocolaterie, CS2903, F-41029 Blois Cedex, France
          bICMPE, 2-8 Rue Henri Dunant, 94320 Thiais, France
          cST Microelectronics, 16 Rue Pierre et Marie Curie, 37100 Tours, France
          Author notes
          * Corresponding author. E-mail: fabiandelorme@ 123456yahoo.fr
          Article
          2226-4108-07-02-160
          10.1007/s40145-018-0267-3

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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