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Research on Hard Magnetic Materials: Synthesis, Properties, and Applications
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Research on Hard Magnetic Materials: Synthesis, Properties, and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 1293

Special Issue Editors

Dr. Petra Jenuš

E-Mail Website
Guest Editor
Jožef Stefan Institute, Ljubljana, Slovenia
Interests: ferrite-based permanent magnets; bottom-up and top-down synthesis of ferrite-based materials; conventional and advanced consolidation of metallic and ceramic materials; hard-soft magnetic composites; phase, microstructure and magnetic characterization; mechanical properties
Dr. César De Julián Fernández

E-Mail Website
Guest Editor
Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parma, Italy
Interests: nanophysics: nanoelectronics, nanophotonics, nanomagnetism; new materials: oxides, alloys, composite, organic-inorganic hybrid, nanoparticles; magnetism; permanent magnets and high anisotropy materials; characterization methods of materials

Special Issue Information

Dear Colleagues,

The Green Transition is the most important challenge of 21st-century society. Magnetic materials play a vital role in this modern transformation as being involved in most sustainable energy-transformation technologies, transport, and novel biomedical applications are key elements for improving energy efficiency, materials reduction, CO2 emission reduction and improvement of health and life quality.

This Special Issue will provide a comprehensive overview and the most recent advances in topics related to the synthesis, properties and applications of magnetic materials that participated in the Green Transition. Therefore, we invite contributions that identify novel synthesis approaches, eco-friendly and/or reduction in energy consumption, and/or improved properties of hard and/or soft magnetic materials that are precisely tailored to offer unique advantages to be used in applications for the Green Transition.

The included topics (but not limited to):

  • Permanent magnets for electric motors (electric traction, vehicles and wind generation);
  • Soft magnetic materials for motors and sensors;
  • Magnetic nanomaterials for biomedical applications, green catalysis and water purification;
  • Designed materials and applications;
  • Magnetocaloric materials for eco-friendly cooling technologies;
  • Materials for IoT and spintronics for energy efficiency improvement;
  • Recycling techniques of magnetic materials.

It is our pleasure to invite you to submit a manuscript. Full papers, communications, and reviews are all welcome.

Dr. Petra Jenuš
Dr. César De Julián Fernández
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic materials
  • hard magnets
  • synthesis
  • magnetic properties
  • hard magnetic composites
  • green transition
  • recycling

Published Papers (1 paper)

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Research

13 pages, 2840 KiB  
Article
Short-Loop Recycling of Nd-Fe-B Permanent Magnets: A Sustainable Solution for the RE2Fe14B Matrix Phase Recovery
by Amit Mishra, Sina Khoshsima, Tomaž Tomše, Benjamin Podmiljšak, Sašo Šturm, Carlo Burkhardt and Kristina Žužek
Materials 2023, 16(19), 6565; https://doi.org/10.3390/ma16196565 - 05 Oct 2023
Viewed by 880
Abstract
The green transition initiatives and exploitation of renewable energy sources require the sustainable development of rare earth (RE)-based permanent magnets prominent technologies like wind turbine generators and electric vehicles. The recycling of RE-based permanent magnets is necessary for the future supply of critical [...] Read more.
The green transition initiatives and exploitation of renewable energy sources require the sustainable development of rare earth (RE)-based permanent magnets prominent technologies like wind turbine generators and electric vehicles. The recycling of RE-based permanent magnets is necessary for the future supply of critical rare-earth elements. The short-loop recycling strategies to directly reprocess Nd-Fe-B magnet waste are economically attractive and practical alternatives to conventional hydro- and pyrometallurgical processes. This study focuses on the development of a procedure to extract the (Nd, Pr)2Fe14B hard-magnetic phase from sintered Nd-Fe-B magnets. The extraction is achieved through preferential chemical leaching of the secondary, RE-rich phases using 1 M citric acid. Before the acid treatment, the magnets were pulverized through hydrogen decrepitation (HD) to increase the material’s surface-to-volume ratio. The as-pulverized Nd-Fe-B powder was subsequently exposed to a 1 M citric acid solution. The effect of leaching time (5–120 min) on the phase composition and magnetic properties was studied. The results of the microstructural (SEM) and compositional (ICP-MS) analyses and the study of thermal degassing profiles revealed that the RE-rich phase is preferentially leached within 5–15 min of reaction time. Leaching of the secondary phases from the magnet’s multi-phase microstructure is governed by the negative electrochemical potential of Nd and Pr. The extraction of (Nd, Pr)2Fe14B grains by the proposed acid leaching approach is compatible with the existing hydrogen processing of magnetic scrap (HPMS) technologies. The use of mild organic acid as a leaching medium makes the leaching process environmentally friendly, as the leaching medium can be easily neutralized after the reaction is completed. Full article
(This article belongs to the Special Issue Research on Hard Magnetic Materials: Synthesis, Properties, and Applications)
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