Abstract
The formation mechanisms for a series of n = 2 Ruddlesden-Popper phases Ln2SrFe2O7 (Ln = La, Nd, Gd, Dy) in the Ln2O3-SrO-Fe2O3 systems were determined. The solid-state synthesis of Ln2SrFe2O7 (Ln = La, Nd) proceeds by a mechanism involving the stage of formation of LnFeO3 and LnSrFeO4 intermediates with their subsequent interaction to form the target product. In the case of Gd2SrFe2O7 formation, two mechanisms are realized, namely, those going through the GdFeO3 + GdSrFeO4 and Gd2O3 + Gd0.5Sr0.5FeO3-α interaction stages. The limiting stage of the Dy2SrFe2O7 formation is the reaction between Dy2O3 and Dy0.5Sr0.5FeO3-α.
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Acknowledgments
The author is deeply grateful to V.V. Gusarov (Ioffe Institute) for valuable advice and assistance in discussing the results and to A.A. Krasilin (Ioffe Institute) for conducting the electron microscopic studies.
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This study was carried out within state assignment theme no. 9.10 implemented at the Ioffe Institute.
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Russian Text © The Author(s), 2019, published in Zhurnal Obshchei Khimii, 2019, Vol. 89, No. 11, pp. 1792–1798.
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Tugova, E.A. Mechanisms of the Solid-State Synthesis of Ln2SrFe2O7 (Ln = La, Nd, Gd, Dy) Layered Perovskite-Related Phases. Russ J Gen Chem 89, 2295–2300 (2019). https://doi.org/10.1134/S1070363219110215
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DOI: https://doi.org/10.1134/S1070363219110215