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In the present work, dense perovskite ceramics were successfully prepared from a series of La1−xBaxCoO3 solid solutions in the range of substitution 0 ≤ x ≤ 0.75 using solid state reaction and conventional sintering. Structural properties of La1−xBaxCoO3 were systematically investigated and thermoelectric properties were measured in the temperature range of 330-1000 K. The results show that the thermoelectric properties of Ba-substituted LaCoO3 depend on x. Indeed, at 330 K, electrical conductivity presents an optimum value for x = 0.25 with a value of σmax ≈ 2.2×105 S·m-1 whereas the Seebeck coefficient decreases when x and/or the temperature increases. The Ba-substituted LaCoO3 samples exhibit p-type semiconducting behaviour. The best power factor value found is 3.4×10-4 W·m-1·K-2 at 330 K for x = 0.075, which is 10% higher than the optimum value measured in La1-xSrxCoO3 for x = 0.05. The thermal diffusivity and thermal conductivity increase with increasing temperature and Ba concentration. La1−xBaxCoO3 shows a maximum figure of merit (ZT = 0.048) for x = 0.05 at 330 K, 25% higher than the best value in La1-xSrxCoO3 compounds.


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Ba substitution for enhancement of the thermoelectric properties of LaCoO3 ceramics (0≤x≤0.75)

Show Author's information Mohamed Ali BOUSNINAa,bFabien GIOVANNELLIaLoïc PERRIEREcGuillaume GUEGANdFabian 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
Université Paris 13, Sorbonne Paris Cite, Laboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, 99 avenue J.B. Clément, F-93430 Villetaneuse, France
Institut de Chimie et des Matériaux Paris-Est, UMR 7182 CNRS-UPEC, 2-8 Rue Henri Dunant, 94320 Thiais, France
ST Microelectronics, 16 Rue Pierre et Marie Curie, Tours 37100, France

Abstract

In the present work, dense perovskite ceramics were successfully prepared from a series of La1−xBaxCoO3 solid solutions in the range of substitution 0 ≤ x ≤ 0.75 using solid state reaction and conventional sintering. Structural properties of La1−xBaxCoO3 were systematically investigated and thermoelectric properties were measured in the temperature range of 330-1000 K. The results show that the thermoelectric properties of Ba-substituted LaCoO3 depend on x. Indeed, at 330 K, electrical conductivity presents an optimum value for x = 0.25 with a value of σmax ≈ 2.2×105 S·m-1 whereas the Seebeck coefficient decreases when x and/or the temperature increases. The Ba-substituted LaCoO3 samples exhibit p-type semiconducting behaviour. The best power factor value found is 3.4×10-4 W·m-1·K-2 at 330 K for x = 0.075, which is 10% higher than the optimum value measured in La1-xSrxCoO3 for x = 0.05. The thermal diffusivity and thermal conductivity increase with increasing temperature and Ba concentration. La1−xBaxCoO3 shows a maximum figure of merit (ZT = 0.048) for x = 0.05 at 330 K, 25% higher than the best value in La1-xSrxCoO3 compounds.

Keywords: perovskite, thermoelectric, Ba-substituted LaCoO3, oxide, p-type semiconductor

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Publication history

Received: 16 March 2019
Revised: 10 April 2019
Accepted: 15 April 2019
Published: 04 December 2019
Issue date: December 2019

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© The author(s) 2019

Acknowledgements

The authors acknowledge Programme d’Investissment d’Avenir PIA "Tours 2015" for the financial support.

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