Influence of the charge ordering and quantum effects in heterovalent substituted hexaferrites on their microwave characteristics

Alex Trukhanov, M.A. Almessiere, A. Baykal, S.V. Trukhanov, Y. Slimani, D.A. Vinnik, V.E. Zhivulin, A. Yu. Starikov, D.S. Klygach, M.G. Vakhitov, Tatiana Zubar, Daria Tishkevich, E.L. Trukhanova, M. Zdorovets

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

M-type hexagonal ferrites with heterovalent substitutions (Nd3+-Zn2+ and Ti4+) were synthesized. X-Ray diffraction (XRD) powder patterns of Sr(Nd,Zn)xFe12-xO19 and BaFe12-xTixO19 (0.1 ≤ x ≤ 1.0) confirmed the single phase constitution of all investigated samples. High frequency magnetic (permeability), electrical (permittivity), and resonant properties were analyzed. Unexpected behavior in the permittivity and permeability as a function of frequency was observed. Appearance of two peaks for samples with x = 0.1 and 0.9 indicated mixed oxidation state for the Fe ions. Behavior for Sr(Nd,Zn)xFe12-xO19 (0.3 ≤ x ≤ 0.7) confirms the occurrence of the anomalous quantum effect, namely charge disproportionation. The permeability behavior of Ti-substituted samples with a double Fe oxidation state was theoretically discussed in terms of spin states crossover. The behavior of reflection losses for Sr(Nd,Zn)xFe12-xO19 and BaFe12-xTixO19 (0.1 ≤ x ≤ 1.0) samples was discussed in terms of the modalities of charge ordering in heterovalent substituted M-type hexaferrites.
Original languageEnglish (US)
Pages (from-to)1193-1202
Number of pages10
JournalJournal of Alloys and Compounds
Volume788
DOIs
StatePublished - Jun 2019
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry
  • Mechanics of Materials
  • Metals and Alloys
  • Mechanical Engineering

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