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Magnetic states of iron ions in Bi0.75Si0.25FeO3 − y perovskites

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

Hyperfine interactions on 57Fe nuclei in cubic perovskite Bi0.75Sr0.25FeO3 − y in the temperature range 87–700 K are studied using Mössbauer spectroscopy. The temperature of the magnetic phase transition (the Neel point T N ) of bismuth ferrite is T N = 670(3) K. Below T N , the experimental spectra demonstrate a partially resolved magnetic hyperfine structure with broadened lines, which is well described by superposition of four sextets. The values of the hyperfine magnetic field B and the isomer shift δ at room temperature initiated that all iron ions are in the trivalent state. Here, three sextets with the equal isomer shifts (δ1 ≈ δ2 ≈ δ3 = 0.38 mm/s correspond to the iron ions in the octahedral oxygen environment; in the fourth sextet, the iron ions are in the square-pyramidal environment (δ3 = 0.25 mm/s).

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Authors and Affiliations

  1. Moscow State Institute of Radioengineering, Electronics, and Automation (Technical University), pr. Vernadskogo 78, Moscow, 119454, Russia

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

  2. Russian Research Center Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia

    V. M. Cherepanov

Authors
  1. V. S. Pokatilov
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  2. V. V. Pokatilov
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  3. A. S. Sigov
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  4. V. M. Cherepanov
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Additional information

Original Russian Text © V.S. Pokatilov, V.V. Pokatilov, A.S. Sigov, V.M. Cherepanov, 2009, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No. 7, pp. 1012–1014.

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Pokatilov, V.S., Pokatilov, V.V., Sigov, A.S. et al. Magnetic states of iron ions in Bi0.75Si0.25FeO3 − y perovskites. Bull. Russ. Acad. Sci. Phys. 73, 956–958 (2009). https://doi.org/10.3103/S1062873809070296

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  • DOI: https://doi.org/10.3103/S1062873809070296

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