Development and Applications of Advanced Magnetic Ceramic Materials

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (30 December 2021) | Viewed by 5737

Special Issue Editor

Centre for Research and Technology Hellas (CERTH), 57001 Thermi, Greece
Interests: targeted material design and development of soft ferrites; grain boundary engineering; polycrystalline microstructure engineering; power electronics; automotive applications; telecommunication applications
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Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Development and Applications of Advanced Magnetic Ceramic Materials”, aims to include the newest and most important research in the field of magnetic ceramics, in terms of chemical composition design, synthesis processes, as well as morphological and microstructural characteristics towards specific magnetic performance. With an almost 100-year history of advanced magnetic ceramics, global market trends have governed a wide range of applications, such as in motors, rotors, EMI suppression, signal processing, power conversion, data storage, telecommunications, green technologies, electric vehicles, wireless charging, handheld devices, biomedical applications, and many others. Thus, it is of major significance to explore and extend the current knowledge on material performance and potential, so as to enhance future technological breakthroughs in the field. As a Guest Editor of this Special Issue of the open-access journal Magnetochemistry, I am honored to invite you to contribute your original manuscripts and share new important results with the scientific community.

Dr. Vasiliki Tsakaloudi
Guest Editor

Manuscript Submission Information

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Keywords

  • ferrimagnetism
  • magnetic ceramic materials
  • spinels
  • hexagonal ferrites
  • garnets
  • synthesis process
  • magnetic permeability
  • power losses
  • polycrystalline microstructure
  • doping

Published Papers (2 papers)

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Research

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14 pages, 3509 KiB  
Article
Phase Formation, Microstructure and Permeability of Fe-Deficient Ni-Cu-Zn Ferrites, (I): Effect of Sintering Temperature
Magnetochemistry 2021, 7(8), 118; https://doi.org/10.3390/magnetochemistry7080118 - 14 Aug 2021
Cited by 2 | Viewed by 1850
Abstract
We have studied the densification, phase formation, microstructure, and permeability of stoichiometric and Fe-deficient Ni-Cu-Zn ferrites of composition Ni0.30Cu0.20Zn0.50+zFe2-zO4-(z/2) with 0 ≤ z ≤ 0.06 sintered at temperatures from 900 °C to 1150 °C. [...] Read more.
We have studied the densification, phase formation, microstructure, and permeability of stoichiometric and Fe-deficient Ni-Cu-Zn ferrites of composition Ni0.30Cu0.20Zn0.50+zFe2-zO4-(z/2) with 0 ≤ z ≤ 0.06 sintered at temperatures from 900 °C to 1150 °C. The shrinkage is shifted from 1000 °C for z = 0 towards lower temperatures and reaches its maximum rate at 900 °C for z = 0.02. Stoichiometric ferrites show regular growth of single-phase ferrite grains if sintered at Ts ≤ 1100 °C. Sintering at 1150 °C leads to the formation of a small amount of Cu2O, triggering exaggerated grain growth. Fe-deficient compositions (z > 0) form Cu-poor stoichiometric ferrites coexisting with a minority CuO phase after sintering at 900–1000 °C. At Ts ≥ 1050 °C, CuO transforms into Cu2O, and exaggerated grain growth is observed. The formation of Cu oxide second phases is investigated using XRD, SEM, and EDX. The permeability of the ferrites increases with sintering temperature up to a maximum permeability of µ = 230 for z = 0 or µ = 580 for z = 0.02, respectively, at Ts = 1000 °C. At higher sintering temperatures, the permeability decreases, which is due to the formation of a microstructure with intra-crystalline porosity in large grains, and a non-magnetic Cu oxide grain boundary phase. Full article
(This article belongs to the Special Issue Development and Applications of Advanced Magnetic Ceramic Materials)
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Review

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27 pages, 8096 KiB  
Review
Magnetic Losses in Soft Ferrites
Magnetochemistry 2022, 8(6), 60; https://doi.org/10.3390/magnetochemistry8060060 - 02 Jun 2022
Cited by 18 | Viewed by 3147
Abstract
We review the basic phenomenology of magnetic losses from DC to 1 GHz in commercial and laboratory-prepared soft ferrites considering recent concepts regarding their physical interpretation. This is based, on the one hand, on the identification of the contributions to the magnetization process [...] Read more.
We review the basic phenomenology of magnetic losses from DC to 1 GHz in commercial and laboratory-prepared soft ferrites considering recent concepts regarding their physical interpretation. This is based, on the one hand, on the identification of the contributions to the magnetization process provided by spin rotations and domain walls and, on the other hand, the concept of loss separation. It additionally contemplates a distinction between the involved microscopic dissipation mechanisms: spin damping and eddy currents. Selected experimental results on the broadband behavior of complex permeability and losses in Mn-Zn ferrites provide significant examples of their dependence on sintering methods, solute elements, and working temperature. We also highlight the peculiar frequency and temperature response of Ni-Zn ferrites, which can be heavily affected by magnetic aftereffects. The physical modeling of the losses brings to light the role of the magnetic anisotropy and the way its magnitude distribution, affected by the internal demagnetizing fields, acts upon the magnetization process and its dependence on temperature and frequency. It is shown that the effective anisotropy governs the interplay of domain wall and rotational processes and their distinctive dissipation mechanisms, whose contributions are recognized in terms of different loss components. Full article
(This article belongs to the Special Issue Development and Applications of Advanced Magnetic Ceramic Materials)
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