Studying local structural, valence, and magnetic states of iron ions in Bi0.9Ca0.1FeO3 perovskite |
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Authors: | A. S. Sigov V. S. Pokatilov A. O. Konovalova V. V. Pokatilov |
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Affiliation: | 1. Moscow State Technical University of Radioengineering, Electronics, and Automatics (MIREA), Moscow, Russia
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Abstract: | Mössbauer method was used to study a perovskite compound Bi0.9Ca0.1FeO3 at T = 295 K and at temperature above T N . It has been established that Bi0.9Ca0.1FeO3 has a rhombohedral crystal structure similar to that of BiFeO3. The substitution of Ca2+ for Bi3+ ions leads to the formation of three states of Fe3+ ions with an octahedral surroundings and one state with a tetrahedral oxygen surroundings with substantially different hyperfine magnetic fields. All Fe ions are in a trivalent state; the compensation of the charge deficit occurs via the formation of oxygen vacancies. Above T N , two structurally nonequivalent states of Fe3+ ions exist in the Bi0.9Ca0.1FeO3 sample, which correspond to the Fe3+ ions with an octahedral and tetrahedral oxygen coordination. |
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