Design and Applications of Advanced Magnetic Ceramic Materials: New Insights

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: 28 February 2025 | Viewed by 528

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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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Dear Colleagues,

This Special Issue 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

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Keywords

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

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Published Papers (1 paper)

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Research

12 pages, 13760 KiB  
Article
Phase Formation, Microstructure, and Permeability of Fe-Deficient Ni-Cu-Zn Ferrites (II): Effect of Oxygen Partial Pressure
by Christoph Priese and Jörg Töpfer
Magnetochemistry 2024, 10(12), 97; https://doi.org/10.3390/magnetochemistry10120097 - 3 Dec 2024
Viewed by 308
Abstract
We have investigated the 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 1000 °C in various oxygen partial pressures p [...] Read more.
We have investigated the 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 1000 °C in various oxygen partial pressures pO2, which range from 0.21 atm down to 10−5 atm. The density of the sintered samples is almost independent of the pO2, whereas the grain size of the Fe-deficient ferrites decreases in more reducing atmospheres. Stoichiometric ferrites show a regular growth of single-phase ferrite grains if sintered in air. Sintering at pO2 ≤ 10−2 atm leads to the formation of a small amount of Cu2O at grain boundaries and triple points. Fe-deficient compositions (z > 0) form Cu-poor stoichiometric ferrites, which coexist with a minority CuO phase homogeneously distributed between the grains after sintering in air. At pO2 ≤ 10−2 atm, the CuO grain boundary phase starts to transform into Cu2O, which concentrates at some triple points at pO2 = 10−2 atm, and it is more homogeneously distributed between the ferrite grains at the lower pO2. Formation of the Cu oxide second phases is investigated using XRD, SEM, and EDX. The permeability at 1 MHz of the stoichiometric ferrites (z = 0) is between µ′ = 200 and µ′ = 300 within the studied range of the pO2. The permeability at 1 MHz of the Fe-deficient samples decreases with the pO2, e.g., from µ′ = 750 at pO2 = 0.21 atm to µ′ = 320 at pO2 = 10−5 atm for z = 0.02, respectively. Full article
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