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  Dense strontium hexaferrite-based permanent magnet composites assisted by cold sintering process

García-Martin, E., Granados-Miralles, C., Ruiz-Gómez, S., Pérez, L., del Campo, A., Guzmán-Mínguez, J. C., et al. (2022). Dense strontium hexaferrite-based permanent magnet composites assisted by cold sintering process. Journal of Alloys and Compounds, 917: 165531, pp. 1-8. doi:10.1016/j.jallcom.2022.165531.

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García-Martin, Eduardo1, Author
Granados-Miralles, Cecilia1, Author
Ruiz-Gómez, Sandra2, Author           
Pérez, Lucas1, Author
del Campo, Adolfo1, Author
Guzmán-Mínguez, Jesús Carlos1, Author
Fernández, César de Julián1, Author
Quesada, Adrián1, Author
Fernández, José F.1, Author
Serrano, Aida1, Author
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1External Organizations, ou_persistent22              
2Spin3D: Three-Dimensional Magnetic Systems, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3385536              

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 Abstract: The use of rare-earth-based permanent magnets is one of the critical points for the development of the current technology. On the one hand, industry of the rare-earths is highly polluting due to the negative environmental impact of their extraction and, on the other hand, the sector is potentially dependent on China. Therefore, investigation is required both in the development of rare-earth-free permanent magnets and in sintering processes that enable their greener fabrication with attractive magnetic properties at a more competitive price. This work presents the use of a cold sintering process (CSP) followed by a post annealing at 1100 degrees C as a new way to sinter composite permanent magnets based on strontium ferrite (SFO). Composites that incorporate a percentage <= 10% of an additional magnetic phase have been prepared and the morphological, structural and magnetic properties have been evaluated after each stage of the process. CSP induces a phase transformation of SFO in the composites, which is partially recovered by the post thermal treatment improving the relative density to 92% and the magnetic response of the final magnets with a coercivity of up to 3.0 kOe. Control of the magnetic properties is possible through the composition and the grain size in the sintered magnets. These attractive results show the potential of the sintering approach as an alternative to develop modern rare-earth-free composite permanent magnets.(c) 2022 The Author(s). Published by Elsevier B.V. CC_BY_NC_ND_4.0

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Language(s): eng - English
 Dates: 2022-05-222022-05-22
 Publication Status: Published in print
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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 917 Sequence Number: 165531 Start / End Page: 1 - 8 Identifier: ISSN: 0925-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954925567746