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

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    Type
    Article
    Authors
    Trukhanov, Alex cc
    Almessiere, M.A.
    Baykal, A.
    Trukhanov, S.V.
    Slimani, Y.
    Vinnik, D.A. cc
    Zhivulin, V.E.
    Starikov, A. Yu.
    Klygach, D.S. cc
    Vakhitov, M.G.
    Zubar, Tatiana cc
    Tishkevich, Daria cc
    Trukhanova, E.L.
    Zdorovets, M.
    Date
    2019-06
    Permanent link to this record
    http://hdl.handle.net/10754/668093
    
    Metadata
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    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.
    Citation
    Trukhanov, A. V., Almessiere, M. A., Baykal, A., Trukhanov, S. V., Slimani, Y., Vinnik, D. A., … Zdorovets, M. (2019). Influence of the charge ordering and quantum effects in heterovalent substituted hexaferrites on their microwave characteristics. Journal of Alloys and Compounds, 788, 1193–1202. doi:10.1016/j.jallcom.2019.02.303
    Sponsors
    The work was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0011. And also it was performed with partial financial supports from the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST « MISiS» (grants No. П02-2017-2-4, No. К3-2018-026, No. К4-2017-041) and SUSU (grant No. 4.1346.2017/4.6). Financial supports from Institute for Research & Medical Consultations (IRMC) of Imam Abdulrahman Bin Faisal University (IAU – Saudi Arabia) are greatly acknowledged [Grant No. 2018-IRMC-S-1]. The Core Labs of King Abdullah University of Science and Technology (KAUST) are greatly acknowledged for their technical assistance. Electromagnetic measurements were performed at the expense of a grant from the Russian Science Foundation (project No. 18-79-00154).
    Publisher
    Elsevier BV
    Journal
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2019.02.303
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0925838819307698
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jallcom.2019.02.303
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