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Journal of Advanced Ceramics

, Volume 7, Issue 2, pp 160–168 | Cite as

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

  • M. A. Bousnina
  • R. Dujardin
  • L. Perriere
  • F. Giovannelli
  • G. Guegan
  • F. Delorme
Open Access
Research Article

Abstract

In this work, we synthesized cubic perovskite ceramics of the whole La1–xSr x CoO3 (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–xSr x CoO3 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.

Keywords

perovskite cobalt oxide solid solution electrical conductivity thermoelectric 

Notes

Acknowledgements

The authors acknowledge ADEME (Agence de l’Environnement et de la Maîtrise de l’Energie) and Plan d’Investissment d’Avenir PIA “Tours 2015” for the financial support.

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© 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.

Authors and Affiliations

  • M. A. Bousnina
    • 1
  • R. Dujardin
    • 1
  • L. Perriere
    • 2
  • F. Giovannelli
    • 1
  • G. Guegan
    • 3
  • F. Delorme
    • 1
  1. 1.Université François Rabelais de Tours, CNRS, INSA CVL, GREMAN UMR7347, IUT de BloisBlois CedexFrance
  2. 2.ICMPEThiaisFrance
  3. 3.ST MicroelectronicsToursFrance

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