Effect of the Reaction Medium on the Structure of the La1−x Cax MnO3 (x = 0–1) Solid Solutions Prepared by the Pechini Method Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2011, Volume: 52, Number: 1, Pages: 104-110 Pages count : 7 DOI: 10.1134/S002315841101006X | ||||
Tags | Perovskite; Reaction Medium; High Resolution Transmission Electron Microscopic; Manganese Oxide Perovskite Structure | ||||
Authors |
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Affiliations |
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Funding (1)
1 | The Ministry of Education and Science of the Russian Federation | 2.1.1/729 |
Abstract:
The phase composition and microstructure of La1 − x Ca x MnO3 (x = 0–1) materials prepared by the Pechini method from polymer-salt stocks were studied after testing these materials in methane oxidation. According to X-ray diffraction data, the reaction medium causes no significant changes in the samples, while high-resolution transmission electron microscopy indicates that the x > 0.3 samples are unstable. Under the action of the reaction medium, the perovskite structure of these samples undergoes partial decomposition accompanied by the formation of planar defects having a lower manganese content. The number and degree of segregation of these defects increase with increasing calcium content. The calcium oxide and manganese oxide phases as segregated nanoparticles are observed on the particle surface. These changes are caused by the decrease in the oxygen content of the manganites under the action of the reaction medium (T,PO2) , by the formation of vacancies, and by the variation of the charge of the manganese cations, as well as by the charge ordering tendency of the manganese cations. Therefore, the observed changes in catalytic activity under the action of the reaction medium for x > 0.3 can be due to perovskite decomposition accompanied by the formation of planar defects, the release of the manganese oxide and calcium oxide phases, and their subsequent sintering.
Cite:
Isupova L.A.
, Gerasimov E.Y.
, Zaikovskii V.I.
, Tsybulya S.V.
Effect of the Reaction Medium on the Structure of the La1−x Cax MnO3 (x = 0–1) Solid Solutions Prepared by the Pechini Method
Kinetics and Catalysis. 2011. V.52. N1. P.104-110. DOI: 10.1134/S002315841101006X WOS Scopus РИНЦ
Effect of the Reaction Medium on the Structure of the La1−x Cax MnO3 (x = 0–1) Solid Solutions Prepared by the Pechini Method
Kinetics and Catalysis. 2011. V.52. N1. P.104-110. DOI: 10.1134/S002315841101006X WOS Scopus РИНЦ
Original:
Исупова Л.А.
, Герасимов Е.Ю.
, Зайковский В.И.
, Цыбуля С.В.
Влияние реакционной среды на структуру твердых растворов La1-xCaxMnO3 (x = 0-1), приготовленных методом Pechini
Кинетика и катализ. 2011. Т.52. №1. С.106-112. РИНЦ
Влияние реакционной среды на структуру твердых растворов La1-xCaxMnO3 (x = 0-1), приготовленных методом Pechini
Кинетика и катализ. 2011. Т.52. №1. С.106-112. РИНЦ
Dates:
Submitted: | Apr 12, 2010 |
Published print: | Feb 1, 2011 |
Published online: | Feb 23, 2011 |
Identifiers:
Web of science | WOS:000289260900017 |
Scopus | 2-s2.0-79952773016 |
Elibrary | 16683851 |
Chemical Abstracts | 2011:233134 |
Chemical Abstracts (print) | 155:248820 |
OpenAlex | W2034959429 |