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Studying local structural, valence, and magnetic states of iron ions in Bi0.9Ca0.1FeO3 perovskite

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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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Authors and Affiliations

  1. Moscow State Technical University of Radioengineering, Electronics, and Automatics (MIREA), Moscow, Russia

    A. S. Sigov, V. S. Pokatilov, A. O. Konovalova & V. V. Pokatilov

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  1. A. S. Sigov
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  2. V. S. Pokatilov
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  3. A. O. Konovalova
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  4. V. V. Pokatilov
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Additional information

Original Russian Text © A.S. Sigov, V.S. Pokatilov, A.O. Konovalova, V.V. Pokatilov, 2013, published in Doklady Akademii Nauk, 2013, Vol. 452, No. 6, pp. 622–625.

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Sigov, A.S., Pokatilov, V.S., Konovalova, A.O. et al. Studying local structural, valence, and magnetic states of iron ions in Bi0.9Ca0.1FeO3 perovskite. Dokl. Phys. 58, 438–441 (2013). https://doi.org/10.1134/S1028335813100121

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  • DOI: https://doi.org/10.1134/S1028335813100121

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