Synthesis and Study of (Sr,La)2FeCo0.5Mo0.5O6 – δ Oxides with Double Perovskite Structure

Abdullaev, M.M.; Istomin, S.Y.; Sobolev, A.V.; Presnyakov, I.A.; Antipov, E.V.

Авторы: Abdullaev M.M., Istomin S.Ya, Sobolev A.V., Presnyakov I.A., Antipov E.V.
Журнал: Russian Journal of Inorganic Chemistry, издательство Maik Nauka/Interperiodica Publishing (Russian Federation),
Том: 64
Номер: 6
Год издания: 2019
Первая страница: 572
Последняя страница: 580
DOI: 10.1134/S0036023619060032
Аннотация: Complex oxides Sr2 – xLaxFeCo0.5Mo0.5O6 – δ, (x = 0.2, 0.4; δ ≈ 0.03–0.15) have been first synthesized by the sol–gel method. Their crystal structures have been refined by the Rietveld method; the refinement showed that the complex oxides have the structure of cubic double perovskite (a ≈ 2aper, space group Fm3m) with partial ordering of Fe(Co) and Mo in the B positions. Based on the 57Fe Mössbauer measurements, the average formal oxidation state of iron has been found to decrease from +3.20 (x = 0.0) to +3.04 (x = 0.4). Our study of the behavior of perovskites in a reducing Ar/H2 atmosphere (8%) revealed a decrease in the reduction resistance with decreasing La content (x = 0.4 → 0). The combination of the properties studied, namely chemical stability with respect to the reaction with Ce1 – xGdxO2 – x/2 and Zr1 – xYxO2 – x/2, hightemperature thermal expansion, and electrical conductivity in air and Ar/H2, shows that Sr1.6La0.4Fe- Co0.5Mo0.5O6 – δ (δ ≈ 0.03) perovskite is more attractive as an electrode material for medium-temperature symmetric solid oxide fuel cells than Sr2FeCo0.5Mo0.5O6 – δ.
Добавил в систему: Истомин Сергей Яковлевич

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Synthesis and Study of (Sr,La)2FeCo0.5Mo0.5O6 – δ Oxides with Double Perovskite Structureстатья

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