Abstract
The La1–xCaxMn0.5Co0.5O3 solid solutions (x = 0.2-0.6) are prepared by the Pechini method and characterized by a number of physical and chemical methods. It is shown that the oxygen nonstoichiometry in the samples significantly increases with increasing number of calcium cations in the La sublattice. The thermal analysis of the samples shows that the lattice oxygen is released at ~600 °C for all samples and that its amount increases with increasing calcium content. The in situ powder XRD data obtained in the He atmosphere indicate that the studied solid solutions with x ≥ 0.4 are unstable under these conditions and may exhibit partial structural destruction and that the ABO3 complex oxide in the system with x = 0.6 transforms into a phase characterized by the A2BO4 structural type of the Ruddlesden–Popper series.
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This work was funded by the Russian Science Foundation (project No. 23-23-00535) and was performed using the equipment of the Shared Research Center “National Center of Investigation of Catalysts” at the Boreskov Institute of Catalysis Siberian Branch, Russian Academy of Sciences.
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Russian Text © The Author(s), 2024, published in Zhurnal Strukturnoi Khimii, 2024, Vol. 65, No. 1, 120613.https://doi.org/10.26902/JSC_id120613
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Kapishnikov, A.V., Bespalko, Y.N., Shuvarakova, E.I. et al. Influence of Oxygen Nonstoichiometry on the Structural Stability of La1–xCaxMn0.5Co0.5O3 Complex Oxides (x = 0.2–0.6) Subjected to Heat Treatment in He. J Struct Chem 65, 107–116 (2024). https://doi.org/10.1134/S0022476624010104
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DOI: https://doi.org/10.1134/S0022476624010104