High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes

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 o...

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Bibliographic Details
Published in:Materials 2020-09, Vol.13 (18), p.4044
Main Authors: Szpunar, Iga, Strandbakke, Ragnar, Sørby, Magnus Helgerud, Wachowski, Sebastian Lech, Balaguer, Maria, Tarach, Mateusz, Serra, José M., Witkowska, Agnieszka, Dzik, Ewa, Norby, Truls, Gazda, Maria, Mielewczyk-Gryń, Aleksandra
Format: Article
Language:English
Subjects:
Cobalt
Cooling
Electrical properties
Energy conversion
High temperature
Perovskites
Phase transitions
Spectrum analysis
Stoichiometry
Symmetry
Synchrotron radiation
Synchrotrons
Temperature
Thermogravimetry
Valence
X ray absorption
X ray powder diffraction
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13184044