Abstract
The homogeneity range of EuMnO3 has been determined using x-ray diffraction analysis of single-and mixed-phase Eu2−x MnxO3+δ samples (0.90≤x≤1.20, Δx = 0.02) prepared from oxide mixtures by solid-state reactions in air between 900 and 1400°C. The results have been used to construct a partial phase diagram of the Eu-Mn-O system in air. The dependences of unit-cell parameters on x and synthesis temperature are presented for the samples synthesized at 1100 and 1400°C and for EuMnO3, respectively. The solubility of europium oxide in EuMnO3 is tentatively attributed to structural defects, and that of managanese oxides is interpreted in terms of structural defects, oxygen nonstoichiometry of europium manganite, the disproportionation reaction 2Mn3+ = Mn2+ + Mn4+, and partial substitution of the resulting Mn2+ for Eu3+ on the cuboctahedral site of the perovskite-like structure. To check these assumptions, systematic studies of the oxygen nonstoichiometry and structure of Eu2−x MnxO3+δ solid solutions synthesized at different temperatures are needed.
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Original Russian Text © O.M. Fedorova, V.F. Balakirev, Yu.V. Golikov, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 9, pp. 1109–1112.
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Fedorova, O.M., Balakirev, V.F. & Golikov, Y.V. Stability region of Eu2−x MnxO3+δ solid solutions in air. Inorg Mater 43, 994–997 (2007). https://doi.org/10.1134/S0020168507090154
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DOI: https://doi.org/10.1134/S0020168507090154