Structural Stability of Perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the Media with Different Partial Pressures of Oxygen | Sciact - CRIS-system of Boreskov Institute of Catalysis

Structural Stability of Perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the Media with Different Partial Pressures of Oxygen Full article

Journal

Journal of Structural Chemistry
ISSN: 0022-4766 , E-ISSN: 1573-8779

Output data

Year: 2021, Volume: 62, Number: 5, Pages: 762–770 Pages count : 9 DOI: 10.1134/S0022476621050127

Tags

inorganic compounds, complex oxides, perovskites, in situ X-ray diffraction, phase transformations

Authors

Kapishnikov A.V. ^1,2 , Gerasimov E.Yu. ^1,2 , Prosvirin I.P. ¹ , Nikolaeva O.A. ¹ , Isupova L.A. ¹ , Tsybulya S.V. ^1,2

Affiliations

1	Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2	Novosibirsk State University, Novosibirsk, Russia

Perovskite-like complex oxide La0.5Ca0.5Mn0.5Co0.5O3±δ synthesized by the Pechini method is characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Structural transformations of this compound in the media with different partial pressures of oxygen and in the medium with hydrogen are studied in situ for the first time. The solid solution in the medium with low partial pressure of oxygen is shown to be unstable. The structural state of the sample is affected not only by the presence/absence of oxygen in the medium but also by the rate of sample cooling. X-ray diffraction and thermal analysis reveal that perovskite undergoes polymorphic transition from orthorhombic to cubic symmetry at 600 °C due to oxygen loss. Reducing the sample by hydrogen leads to the formation of two perovskite-like phases with pseudo-cubic and orthorhombic symmetries, possibly, due to the inhomogeneous formation of vacancies in the solid solution and changes in the oxidation states of cobalt and manganese cations. It is shown that the initial structure can be partially regenerated from the complex oxide reduced in H2.

Kapishnikov A.V. , Gerasimov E.Y. , Prosvirin I.P. , Nikolaeva O.A. , Isupova L.A. , Tsybulya S.V.
Structural Stability of Perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the Media with Different Partial Pressures of Oxygen
Journal of Structural Chemistry. 2021. V.62. N5. P.762–770. DOI: 10.1134/S0022476621050127 WOS Scopus РИНЦ AN OpenAlex

Капишников А.В. , Герасимов Е.Ю. , Просвирин И.П. , Николаева О.А. , Исупова Л.А. , Цыбуля С.В.
Структурная стабильность перовскита La0.5Ca0.5Mn0.5Co0.5O3±δ в средах с различным парциальным давлением кислорода
Журнал структурной химии. 2021. Т.62. №5. С.817-826. DOI: 10.26902/jsc_id72901 РИНЦ OpenAlex

Submitted:	Oct 20, 2020
Accepted:	Dec 3, 2020
Published print:	May 1, 2021
Published online:	Jun 18, 2021

Web of science:	WOS:000663346100012
Scopus:	2-s2.0-85108069099
Elibrary:	46819224
Chemical Abstracts:	2021:1365818
OpenAlex:	W3175419508

DB	Citing
Web of science	1
Elibrary	2
OpenAlex	1