najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2025-16-1-51-57najo-85Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХPhase transformations in perovskites La0:6Ca0:4Mn1-yCoyO3±δ under the action of hydrogenФазовые превращения в твердых растворах La0.6Ca0.4Mn1-yCoyO3±δ происходящие в водородсодержащей средеhttps://orcid.org/0000-0002-3921-5629КапишниковА. В.KapishnikovA. V.

пр. ак. Лаврентьева 5 , Новосибирск, 630090

Alexander V. Kapishnikov

Lavrentieva Ave, 5, Novosibirsk, 630090

avl97@mail.ruhttps://orcid.org/0000-0002-3230-3335ГерасимовЕ. Ю.GerasimovE. Yu.

пр. ак. Лаврентьева 5 , Новосибирск, 630090

Evgeny Yu. Gerasimov

Lavrentieva Ave, 5, Novosibirsk, 630090

gerasimov@catalysis.ruИнститут катализа СО РАНBoreskov Institute of Catalysis SB RAS2025010620251615157Copyright © Kapishnikov A.V., Gerasimov E.Y., 20252025Капишников А.В., Герасимов Е.Ю.Kapishnikov A.V., Gerasimov E.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/85

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.

Проведено исследование структурно-фазовых превращений твёрдых растворов La0.6Ca0.4Mn1-yCoyO3±δ в восстановительной атмосфере, в частности, с использованием методов "in situ" РФА и ПЭМВР. Исследования показали, что термообработка в восстановительной атмосфере Н2 приводит к частичному расслоению твёрдых растворов, характер которого отличается от расслоения в инертной атмосфере. В случае системы с восстановительным характером, неоднородное восстановление структуры приводит к формированию орторомбической фазы перовскита на основе LaMnO3 с разупорядоченными вакансиями, дополнительной фазы упорядоченного перовскита типа Рудлесдена-Поппера на основе La2CoO4 и наночастиц Co и Ca2MnO4 на поверхности перовскита. В среде с избыточным парциальным давлением кислорода для восстановленного образца происходит обратный фазовый переход фазы Рудлесдена-Поппера в фазу перовскита.

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The authors declare that there are no conflicts of interest present.