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La0.5Sr0.5FeO3 – γ Ferrite Studied by Raman Spectroscopy

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

Abstract

Transformations of polycrystalline La0.5Sr0.5FeO3 – γ ferrites subjected to vacuum annealing in the temperature range of 400–650°C were studied by Raman spectroscopy at ambient conditions. It was shown that the homogeneity of the sample and its local ordering depended on the vacuum annealing temperature. An increase in the vacuum annealing temperature resulted in a gradual loss of oxygen and a transition of all iron ions to the oxidation state Fe3+. These ferrites demonstrated a shift of the whole Raman spectra (including two-magnon modes) to higher frequencies with increasing Sr content of 0 < x < 0.5. The possible reasons for the observed effects are discussed.

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ACKNOWLEDGMENTS

The authors wish to acknowledge using the micro-Raman optical system of the Research Facility Center in the Osipyan Institute of Solid State Physics, Russian Academy of Sciences, for the data acquisition.

Funding

This work was carried out within the framework of the state task of the Osipyan Institute of Solid State Physics, Russian Academy of Sciences.

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Authors and Affiliations

  1. Osipyan Institute of Solid-State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russia

    K. A. Gavrilicheva, O. I. Barkalov & V. D. Sedykh

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  1. K. A. Gavrilicheva
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  2. O. I. Barkalov
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  3. V. D. Sedykh
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Correspondence to K. A. Gavrilicheva.

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Gavrilicheva, K.A., Barkalov, O.I. & Sedykh, V.D. La0.5Sr0.5FeO3 – γ Ferrite Studied by Raman Spectroscopy. Bull. Russ. Acad. Sci. Phys. 87 (Suppl 1), S36–S40 (2023). https://doi.org/10.1134/S1062873823704373

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  • DOI: https://doi.org/10.1134/S1062873823704373

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