Abstract
The features of the composition, crystal, and magnetic structure of Ti-substituted barium hexaferrite BaFe12 – xTixO19 (0.25 ≤ x ≤ 1.5) are studied by Mössbauer spectroscopy, vibration magnetometry, X-ray diffraction, and simultaneous thermal analysis. Bounded heterovalent isomorphism implemented by the scheme 2Fe3+ → Ti4+ + Fe2+ while retaining the charge balance is established when Fe3+ ions are partially substituted with Ti4+ ions. An increase in the 3d-electron density and the presence of Fe2+ in BaFe12 – xTixO19 samples with x = 1.5 is detected by Mössbauer spectroscopy. The heterovalent isomorphic substitution limit is determined to be within 0.75 < x < 1.0. Using Mössbauer spectroscopy and X-ray diffraction, the formation of titanium-contained phases at x = 1.0 whose content increases with the degree of substitution is shown. The data on the preferential distribution of substituent ions (Ti4+) in the barium hexaferrite structure at the 12k and 2b sites are presented.
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This study was supported by the Russian Science Foundation, agreement no. 19-19-00694, May 6, 2019.
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Korovushkin, V.V., Trukhanov, A.V., Kostishin, V.G. et al. Study of Features of the Composition, Magnetic, and Crystal Structure of Barium Hexaferrite BaFe12 – xTixO19. Phys. Solid State 62, 891–901 (2020). https://doi.org/10.1134/S1063783420050145
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DOI: https://doi.org/10.1134/S1063783420050145