Special Issue "Oxide Magnetics"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 31 July 2021.

Special Issue Editor

Prof. Dr. Sergei Trukhanov
Website
Guest Editor
Scientific Practical Materials Research Centre of National Academy of Sciences of Belarus, Minsk, Belarus
Interests: chemistry and physics of complex transition metal alloys and oxides in micro-, meso-, and nanoforms; crystal and magnetic structures; phase transitions; magnetic state; colossal magnetoresistance; magnetoelectric effect; multiferroics; microwave absorption; microwave magnetodielectric materials for 5G technology; functional composite materials for microwave absorption
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Special Issue Information

Dear colleagues,

Preparation of complex transition metal oxides and investigation of their structure, magnetic, electrical, and dielectric properties is an actual trend of condensed matter physics and chemistry. This topic is not only important from a fundamental point of view, but it also has great applied importance. Complex transition metal oxides belong to the so-called class of strongly correlated electronic systems, since they demonstrate a strong interconnection of magnetic, electrical, and elastic properties among the most commonly used 3D metals, such as Cr, Mn, Fe, Co, and Ni. However, the most promising for practical use are iron-based oxides with perovskite (orthoferrites), spinel (spinel-ferrites), and magnetoplumbite (hexaferrites) structures. Their prospects are determined by high values of total magnetic moment and temperature of phase transitions. Nanometer particle size significantly alters their electronic properties. Complex transition metal oxides are promising for practical use as permanent magnets, spintronics elements, and microwave materials for 5G communication technology.

Prof. Dr. Sergei Trukhanov
Guest Editor

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Keywords

  • crystal structure
  • magnetic structure
  • magnetization
  • magnetic phase transition
  • electrical resistivity
  • magnetoresistance
  • polarization
  • magnetodielectric
  • multiferroics
  • microwave absorption

Published Papers (2 papers)

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Research

Open AccessArticle
Peculiarities of the Crystal Structure Evolution of BiFeO3–BaTiO3 Ceramics across Structural Phase Transitions
Nanomaterials 2020, 10(4), 801; https://doi.org/10.3390/nano10040801 - 21 Apr 2020
Abstract
Evolution of the crystal structure of ceramics BiFeO3–BaTiO3 across the morphotropic phase boundary was analyzed using the results of macroscopic measuring techniques such as X-ray diffraction, differential scanning calorimetry, and differential thermal analysis, as well as the data obtained by [...] Read more.
Evolution of the crystal structure of ceramics BiFeO3–BaTiO3 across the morphotropic phase boundary was analyzed using the results of macroscopic measuring techniques such as X-ray diffraction, differential scanning calorimetry, and differential thermal analysis, as well as the data obtained by local scale methods of scanning probe microscopy. The obtained results allowed to specify the concentration and temperature regions of the single phase and phase coexistent regions as well as to clarify a modification of the structural parameters across the rhombohedral–cubic phase boundary. The structural data show unexpected strengthening of structural distortion specific for the rhombohedral phase, which occurs upon dopant concentration and temperature-driven phase transitions to the cubic phase. The obtained results point to the non-monotonous character of the phase evolution, which is specific for metastable phases. The compounds with metastable structural state are characterized by enhanced sensitivity to external stimuli, which significantly expands the perspectives of their particular use. Full article
(This article belongs to the Special Issue Oxide Magnetics)
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Open AccessArticle
Investigation of AC-Measurements of Epoxy/Ferrite Composites
Nanomaterials 2020, 10(3), 492; https://doi.org/10.3390/nano10030492 - 09 Mar 2020
Cited by 2
Abstract
A pure ferrite and epoxy samples as well as the epoxy/ferrite composites with different 20 wt.%, 30 wt.%, 40 wt.%, and 50 wt.% weight ferrite contents have been prepared by the chemical co-precipitation method. AC-conductivity and dielectric properties such as the dielectric constant [...] Read more.
A pure ferrite and epoxy samples as well as the epoxy/ferrite composites with different 20 wt.%, 30 wt.%, 40 wt.%, and 50 wt.% weight ferrite contents have been prepared by the chemical co-precipitation method. AC-conductivity and dielectric properties such as the dielectric constant and dielectric loss of the prepared samples have been studied. The obtained results showed that the samples had a semiconductor behavior. The dielectric constant of the composites has been calculated theoretically using several models. For the composite sample that contains 20 wt.% of ferrites, these models give satisfactory compliance, while for the composite samples with a higher percentage of nanofillers, more than 30 wt.% theoretical results do not coincide with experimental data. The investigated polymer has very low conductivity, so this type of polymer can be useful for high-frequency applications, which can reduce the losses caused by eddy current. Thus, the prepared samples are promising materials for practical use as elements of microwave devices. Full article
(This article belongs to the Special Issue Oxide Magnetics)
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