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Influence of nano-VC on the structural and magnetic properties of MnAlC-alloy
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-8690-9957
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics.ORCID iD: 0000-0002-1527-8668
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics.ORCID iD: 0000-0003-3574-2146
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-5511-5986
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2021 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 11, article id 14453Article in journal (Refereed) Published
Abstract [en]

Alloys of Mn55Al45C2 with additions of VC nano-particles have been synthesized and their properties evaluated. The Mn55Al45C2(VC)(x) (x=0.25, 0.5 and 1) alloys have been prepared by induction melting resulting in a high content of the ferromagnetic tau -phase (>94 wt.%). Powder X-ray diffraction indicates that nano-VC can be dissolved in the alloy matrix up to 1 at.%. On the other side, metallography investigations by scanning electron microscopy and scanning transmission electron microscope show inclusions of the nanosized additives in the microstructure. The effect of nano-VC on the grain and twin boundaries has been studied by electron backscattering diffraction. The magnetization has been measured by magnetometry up to 9 T while the domain structure has been studied using both magnetic force microscopy as well as Kerr-microscopy. For nano-VC contents above 0.25 at.%, a clear increase of the coercive force is observed, from 57 to 71 kA/m. The optimum appears to be for 0.5 at.% nano-VC which shows a 25% increase in coercive force without losing any saturation magnetization. This independent increase in coercivity is believed to originate from the nano-VC reducing the overall magnetic domain size. Overall, we observe that addition of nano-VC could be an interesting route to increase the coercive force of MnAl, without sacrificing saturation magnetization.

Place, publisher, year, edition, pages
NATURE RESEARCH Springer Nature, 2021. Vol. 11, article id 14453
National Category
Condensed Matter Physics Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-452947DOI: 10.1038/s41598-021-93395-2ISI: 000675633500020PubMedID: 34262064OAI: oai:DiVA.org:uu-452947DiVA, id: diva2:1593533
Available from: 2021-09-13 Created: 2021-09-13 Last updated: 2024-01-15Bibliographically approved
In thesis
1. New and old materials for permanent magnets based on earth-abundant elements
Open this publication in new window or tab >>New and old materials for permanent magnets based on earth-abundant elements
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electrical motors, which find use in e.g. electrical vehicles, require per-manent magnets to function. Comparing ferrite magnets and Nd-based magnets reveals a large difference in their price and performance. During the last decade, gap-magnets, with performance in between ferrites and Nd-based magnets have attracted considerable research interest world-wide due to the “rare-earth crisis”. During this crisis, the price of certain rare-earth elements experienced volatile changes. This thesis deals with materials that could be relevant as gap-magnets. The thesis starts with introducing key properties and constraints relevant for gap-magnets. In the thesis, four different systems were investigated. The four systems show that permanent magnets need to be understood and optimized on three distinct levels, the crystal level, the structural level, and the micro-structural level. They show how old and new materials can potentially be utilized as permanent magnets. Lastly, the thesis ends with an outlook that presents new ideas for finding new permanent magnets. The ideas presented in the outlook are ideas that were not treated in this thesis, and thus may represent new ways for further work in developing materials for gap-magnets. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2022. p. 83
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2160
Keywords
permanent magnets, material development, sustainability
National Category
Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-473377 (URN)978-91-513-1525-6 (ISBN)
Public defence
2022-06-14, Polhelmssalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:00 (English)
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Available from: 2022-05-23 Created: 2022-04-26 Last updated: 2022-06-15

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Shtender, VitaliiStopfel, HenryHedlund, DanielKarlsson, DennisAndersson, GabriellaSvedlindh, PeterSahlberg, Martin

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