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Article

High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes

1
Nanotechnology Centre A, Faculty of Applied Physics and Mathematics and Advanced Materials Centre, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland
2
Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
3
Department for Neutron Materials Characterization, Institute for Energy Technology, Instituttveien 18, 2007 Kjeller, Norway
4
Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, Av. Naranjos s/n, E-46022 Valencia, Spain
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(18), 4044; https://doi.org/10.3390/ma13184044
Received: 7 July 2020 / Revised: 28 August 2020 / Accepted: 9 September 2020 / Published: 11 September 2020
(This article belongs to the Special Issue Thermal Analysis of Materials)
The application of double perovskite cobaltites BaLnCo2O6−δ (Ln = lanthanide element) in electrochemical devices for energy conversion requires control of their properties at operating conditions. This work presents a study of a series of BaLnCo2O6−δ (Ln = La, Pr, Nd) with a focus on the evolution of structural and electrical properties with temperature. Symmetry, oxygen non-stoichiometry, and cobalt valence state have been examined by means of Synchrotron Radiation Powder X-ray Diffraction (SR-PXD), thermogravimetry (TG), and X-ray Absorption Spectroscopy (XAS). The results indicate that all three compositions maintain mainly orthorhombic structure from RT to 1000 °C. Chemical expansion from Co reduction and formation of oxygen vacancies is observed and characterized above 350 °C. Following XAS experiments, the high spin of Co was ascertained in the whole range of temperatures for BLC, BPC, and BNC. View Full-Text
Keywords: positrode; cobaltites; synchrotron powder diffraction; X-ray absorption spectroscopy; ceramics; thermal expansion; chemical expansion positrode; cobaltites; synchrotron powder diffraction; X-ray absorption spectroscopy; ceramics; thermal expansion; chemical expansion
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MDPI and ACS Style

Szpunar, I.; Strandbakke, R.; Sørby, M.H.; Wachowski, S.L.; Balaguer, M.; Tarach, M.; Serra, J.M.; Witkowska, A.; Dzik, E.; Norby, T.; Gazda, M.; Mielewczyk-Gryń, A. High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes. Materials 2020, 13, 4044. https://doi.org/10.3390/ma13184044

AMA Style

Szpunar I, Strandbakke R, Sørby MH, Wachowski SL, Balaguer M, Tarach M, Serra JM, Witkowska A, Dzik E, Norby T, Gazda M, Mielewczyk-Gryń A. High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes. Materials. 2020; 13(18):4044. https://doi.org/10.3390/ma13184044

Chicago/Turabian Style

Szpunar, Iga, Ragnar Strandbakke, Magnus H. Sørby, Sebastian L. Wachowski, Maria Balaguer, Mateusz Tarach, José M. Serra, Agnieszka Witkowska, Ewa Dzik, Truls Norby, Maria Gazda, and Aleksandra Mielewczyk-Gryń. 2020. "High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes" Materials 13, no. 18: 4044. https://doi.org/10.3390/ma13184044

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