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Specific features of phase equilibriums in Ln–Ba–Fe–O systems

Abstract : Formation of five-layered Ln 2–ε Ba 3+ε Fe 5 O 15–δ phases [exhibiting nanoscale ordering with layer-by-layer location of the cations in the Ln–Ba–(Ln,Ba)–(Ln,Ba)–Ba–Ln perovskite-type structure] has occurred in the Ln–Ba–Fe–O (Ln = Y, Pr, Nd, Sm, Eu, and Gd) systems at 1100°С in air. Partial substitution of iron with cobalt (Ln 2–ε Ba 3+ε Fe 5–y Co y O 15–δ , Ln = Nd, Sm, Eu) has stabilized formation of the ordered structure. The oxygen content in the complex oxides has been determined in air over a wide temperature range by means of high-temperature thermogravimetry and iodometric titration. The change in oxygen content with temperature for the phases with five-layered ordering was significantly smaller than for the disordered phases. © 2016, Pleiades Publishing, Ltd.
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N.E. Volkova, A.S. Urusova, L.Y. Gavrilova, A.V. Bryuzgina, K.M. Deryabina, et al.. Specific features of phase equilibriums in Ln–Ba–Fe–O systems. Russian Journal of General Chemistry / Zhurnal Obshchei Khimii, MAIK Nauka/Interperiodica, 2016, 86 (8), pp.1800-1804. ⟨10.1134/S1070363216080041⟩. ⟨hal-02184773⟩



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