Phase transformations in perovskites La0:6Ca0:4Mn1-yCoyO3±δ under the action of hydrogen
https://doi.org/10.17586/2220-8054-2025-16-1-51-57
Abstract
The structural and phase transformations of La0:6Ca0:4Mn1-yCoyO3±δ (y = 0:2 – 0:6) solid solutions in a reducing atmosphere were studied using in situ XRD and HRTEM methods. Experiments have shown that heat treatment in a reducing atmosphere of H2 leads to the partial decomposition of solid solutions, the nature of which differs from decomposition in an inert atmosphere. In the case of a system with a hydrogen-containing atmosphere, the heterogeneous reduction of the structure leads to the formation of an orthorhombic phase of LaMnO3-based perovskite with disordered vacancies, an additional phase of ordered Rudlesden–Poppertype perovskite based on La2CoO4 and Co and Ca2MnO4 nanoparticles on the surface of perovskite. In an environment with excessive partial oxygen pressure for the reduced sample, the reverse phase transition of the Rudlesden–Popper phase into the perovskite phase occurs.
Keywords
Rudlesden–Popper-type perovskite,
hydrogen reduction,
lanthanum manganite,
in situ XRD,
phase transition
Supporting agencies: This study was supported by Russian Science Foundation, project No. 23-23-00535. XRD and HRTEM measurements were 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.
About the Authors
A. V. Kapishnikov
Boreskov Institute of Catalysis SB RAS
Russian Federation
Russian Federation
Alexander V. Kapishnikov
Lavrentieva Ave, 5, Novosibirsk, 630090
E. Yu. Gerasimov
Boreskov Institute of Catalysis SB RAS
Russian Federation
Russian Federation
Evgeny Yu. Gerasimov
Lavrentieva Ave, 5, Novosibirsk, 630090
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Review
For citations:
Kapishnikov A.V., Gerasimov E.Yu. Phase transformations in perovskites La0:6Ca0:4Mn1-yCoyO3±δ under the action of hydrogen. Nanosystems: Physics, Chemistry, Mathematics. 2025;16(1):51-57. https://doi.org/10.17586/2220-8054-2025-16-1-51-57
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