Mössbauer Studies of the Phase Composition and Microstructure of the La1-XCaXFeO3-Y System as Related to the Reactivity of Surface and Bulk Oxygen Full article
Journal |
Reaction Kinetics and Catalysis Letters
ISSN: 0133-1736 , E-ISSN: 1588-2837 |
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Output data | Year: 2004, Volume: 81, Number: 2, Pages: 373-382 Pages count : 10 DOI: 10.1023/B:REAC.0000019446.25192.67 | ||||
Tags | Calcium-doped lanthanum ferrite, Mössbauer spectroscopy | ||||
Authors |
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Affiliations |
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Funding (2)
1 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 01-2162 |
2 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 00-00728 |
Abstract:
The phase composition and microstructure of samples of the La1-xCaxFeO3-y system prepared via a ceramic route were characterized by Mössbauer spectroscopy. In all cases, iron was found in the 3+ state. The ordering of anion vacancies in the samples with the composition in the range of 0.8 > x ≥ 0.4, which corresponds to a microheterogeneous solid solution, generates new distorted octahedral and fivefold/tetrahedral sites revealed by two typical sextets. The disordering of this solid solution and small (10-100 Å) sizes of domains with a perovskite, braunmillerite or Grenier phase structure caused the appearance of a superparamagnetic doublet, which grows with the Ca content up to x = 0.8 but disappears in the sample of pure braunmillerite. The appearance of Fe cations in a distorted coordination correlates with the increased activity of the samples with a microheterogeneous structure in the CO catalytic oxidation and with their reducibility by H2.
Cite:
Isupova L.A.
, Yakovleva I.S.
, Gainutdinov I.I.
, Pavlyukhin Y.T.
, Sadykov V.A.
Mössbauer Studies of the Phase Composition and Microstructure of the La1-XCaXFeO3-Y System as Related to the Reactivity of Surface and Bulk Oxygen
Reaction Kinetics and Catalysis Letters. 2004. V.81. N2. P.373-382. DOI: 10.1023/B:REAC.0000019446.25192.67 WOS Scopus РИНЦ
Mössbauer Studies of the Phase Composition and Microstructure of the La1-XCaXFeO3-Y System as Related to the Reactivity of Surface and Bulk Oxygen
Reaction Kinetics and Catalysis Letters. 2004. V.81. N2. P.373-382. DOI: 10.1023/B:REAC.0000019446.25192.67 WOS Scopus РИНЦ
Dates:
Submitted: | Nov 19, 2003 |
Accepted: | Nov 21, 2003 |
Published print: | Mar 1, 2004 |
Identifiers:
Web of science | WOS:000220510600023 |
Scopus | 2-s2.0-1842509232 |
Elibrary | 13470949 |
Chemical Abstracts | 2004:202313 |
Chemical Abstracts (print) | 141:129536 |
OpenAlex | W1968233162 |