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Abstract
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.
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Authors (12)
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Ragnar Strandbakke Dr
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Magnus H. Sorby Dr
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Maria Balaguer Dr
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Mateusz Tarach
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José M Serra
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Truls Norby Dr
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Materials
no. 13,
ISSN: 1996-1944 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Szpunar I., Strandbakke R., Sorby M., Wachowski S., Balaguer M., Tarach M., Serra J., Witkowska A., Dzik E., Norby T., Gazda M., Mielewczyk-Gryń A.: High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes// Materials -Vol. 13,iss. 18 (2020), s.4044-
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma13184044
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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