Magnetic microstructure in strontium hexaferrites with correlated nonisomorphous substitutions

Bashkirov, Sh. Sh.; Liberman, A. B.; Zaripova, L. D.; Valiullin, A. A.

doi:10.1134/1.1129936

Cited by 3 publications

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“…In the case of such substitutions, Mössbauer spectra are difficult to interpret because it is necessary to locate not only M 2+ but also M 4+ ions. In particular, Bashkirov et al [7,8] replaced Fe 3+ ions in strontium hexaferrites by Mn 2+ + Ti 4+ ions in accordance with the general crystal-chemical formula Charge balance poses a much more serious problem if only one type of ion is used for heterovalent substitutions. For example, no systematic data have been reported to date as to integrated studies of correlations between the composition, structure, and magnetic properties of Zn 2+ -substituted barium hexaferrites.…”

Section: Introductionmentioning

confidence: 99%

Correlation between the Chemical Composition, Crystal Structure, and Magnetic Properties of Hexagonal Barium Ferrite with Zn2+ Heterovalent Substitution

et al. 2020

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This paper presents a detailed study of the magnetic and crystal structures of BaFe 12 -x Zn x O 19 (0.25 ≤ x ≤ 1.5) Zn-substituted barium hexaferrite by Mössbauer spectroscopy, vibrating sample magnetometry, and X-ray diffraction. Partial heterovalent substitution of Zn 2+ ions for Fe 3+ ions demonstrates limited heterovalent isomorphism according to the scheme 2Fe 3+ → Zn 2+ + Fe 4+ , which satisfies the electroneutrality constraint. Mössbauer spectroscopy results indicate the presence of Fe 4+ in the BaFe 12 -x Zn x O 19 materials. The heterovalent isomorphous substitution limit has been determined to be x = 1.0. The formation of a zinc spinel has been shown to begin at x = 0.50 and its content increases with increasing zinc content. Data are presented on the predominant character of the substituent ion (Zn 2+ ) distribution in the structure of barium hexaferrite. A correlation has been found between the chemical composition, phase separation, anisotropy of properties, and the temperature of the magnetic phase transition of BaFe 12 -x Zn x O 19 (0.25 ≤ x ≤ 1.5).

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Section: Introductionmentioning

confidence: 99%