Structural stability of perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the media with different partial pressures of oxygen

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Structural stability of perovskite La_0.5Ca_0.5Mn_0.5Co_0.5O_3±δ in the media with different partial pressures of oxygen. / Kapishnikov, A. V.; Gerasimov, E. Yu; Prosvirin, I. P. et al.

In: Journal of Structural Chemistry, Vol. 62, No. 5, 05.2021, p. 762-770.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{ba81ecd65e5f4434a740bf60b67e3c94,

title = "Structural stability of perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the media with different partial pressures of oxygen",

abstract = "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.",

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

author = "Kapishnikov, {A. V.} and Gerasimov, {E. Yu} and Prosvirin, {I. P.} and Nikolaeva, {O. A.} and Isupova, {L. A.} and Tsybulya, {S. V.}",

year = "2021",

month = may,

doi = "10.1134/S0022476621050127",

language = "English",

volume = "62",

pages = "762--770",

journal = "Journal of Structural Chemistry",

issn = "0022-4766",

publisher = "Springer GmbH & Co, Auslieferungs-Gesellschaf",

number = "5",

}

RIS

TY - JOUR

T1 - Structural stability of perovskite La0.5Ca0.5Mn0.5Co0.5O3±δ in the media with different partial pressures of oxygen

AU - Kapishnikov, A. V.

AU - Gerasimov, E. Yu

AU - Prosvirin, I. P.

AU - Nikolaeva, O. A.

AU - Isupova, L. A.

AU - Tsybulya, S. V.

PY - 2021/5

Y1 - 2021/5

N2 - 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.

AB - 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.

KW - complex oxides

KW - in situ X-ray diffraction

KW - inorganic compounds

KW - perovskites

KW - phase transformations

UR - http://www.scopus.com/inward/record.url?scp=85108069099&partnerID=8YFLogxK

U2 - 10.1134/S0022476621050127

DO - 10.1134/S0022476621050127

M3 - Article

AN - SCOPUS:85108069099

VL - 62

SP - 762

EP - 770

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 5

ER -

ID: 28974363