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Perovskites Bi0.8La0.2FeO3 and Bi0.8La0.2Fe0.95Cr0.05O3: Crystal structure and magnetic and charge states of iron ions

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Abstract

Perovskites of the Bi0.8La0.2Fe1 − x Cr x O3 system (x = 0, 0.05) were investigated by Mössbauer spectroscopy in the temperature range of 298–800 K. The samples were fabricated by solid-state synthesis and had a rhombic structure. Iron ions in Bi0.8La0.2FeO3 and Bi0.8La0.2Fe0.95Cr0.05O3 are situated in trivalent states. The magnetic transition temperatures (the Néel temperatures T N ) T N = 677.5 ± 2.5 K for Bi0.8La0.2FeO3 and T N = 647.6 ± 2.5 K for Bi0.8La0.2Fe0.95Cr0.05O3 are measured. The substitution of trivalent iron ions from trivalent chromium ions in the amount x = 0.05 in Bi0.8La0.2Fe0.95Cr0.05O3 perovskite decreases the hyperfine magnetic field at nuclei 57Fe in Fe+3-O-Cr+3 chains by 30 kOe.

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Authors and Affiliations

  1. Moscow State Technical University of Radio Engineering, Electronics, and Automatics, pr. Vernadskogo 78, Moscow, 119454, Russia

    A. S. Sigov, V. S. Pokatilov, A. O. Makarova & 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. Makarova
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  4. V. V. Pokatilov
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Correspondence to V. S. Pokatilov.

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Original Russian Text © A.S. Sigov, V.S. Pokatilov, A.O. Makarova, V.V. Pokatilov, 2014, published in Doklady Akademii Nauk, 2014, Vol. 456, No. 6, pp. 655–658.

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Sigov, A.S., Pokatilov, V.S., Makarova, A.O. et al. Perovskites Bi0.8La0.2FeO3 and Bi0.8La0.2Fe0.95Cr0.05O3: Crystal structure and magnetic and charge states of iron ions. Dokl. Phys. 59, 267–270 (2014). https://doi.org/10.1134/S1028335814060123

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  • DOI: https://doi.org/10.1134/S1028335814060123

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