High-temperature structural and electrical properties of BaLnCo2O6 positrodes

The application of double perovskite cobaltites BaLnCoO (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 BaLnCoO (Ln = La, Pr, Nd) with a focus on the evolution of struct...

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Detalles Bibliográficos
Autores: Szpunar, I., Strandbakke, R., Sørby, Magnus H., Wachowski, S.L., Balaguer, María, Tarach, M., Serra Alfaro, José Manuel, Witkowska, A., Dzik, E., Norby, Truls, Gazda, M., Mielewczyk-Gry¿, A
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/226523
Acceso en línea:http://hdl.handle.net/10261/226523
Access Level:acceso abierto
Descripción
Sumario:The application of double perovskite cobaltites BaLnCoO (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 BaLnCoO (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.

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