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High-Temperature Structural and Electrical Properties of BaLnCo2O6 Positrodes.

ABSTRACT: The application of double perovskite cobaltites BaLnCo2O6-? (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-? (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.

SUBMITTER: Szpunar I 

PROVIDER: S-EPMC7558619 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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High-Temperature Structural and Electrical Properties of Ba<i>Ln</i>Co<sub>2</sub>O<sub>6</sub> Positrodes.

Szpunar Iga I   Strandbakke Ragnar R   Sørby Magnus Helgerud MH   Wachowski Sebastian Lech SL   Balaguer Maria M   Tarach Mateusz M   Serra José M JM   Witkowska Agnieszka A   Dzik Ewa E   Norby Truls T   Gazda Maria M   Mielewczyk-Gryń Aleksandra A  

Materials (Basel, Switzerland) 20200911 18

The application of double perovskite cobaltites Ba<i>Ln</i>Co<sub>2</sub>O<sub>6-δ</sub> (<i>Ln</i> = 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 Ba<i>Ln</i>Co<sub>2</sub>O<sub>6-δ</sub> (<i>Ln</i> = 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  ...[more]

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