(Fe,Co)2(P,Si) rare-earth free permanent magnets

Title

(Fe,Co)2(P,Si) rare-earth free permanent magnets: From macroscopic single crystals to submicron-sized particles

 Author

Yibole, H. (Inner Mongolia Normal University China)
Lingling-Bao, B. (Inner Mongolia Normal University China)
Xu, J. (TU Delft Mechanical, Maritime and Materials Engineering; Inner Mongolia Normal University China)
Alata, H. (Inner Mongolia Normal University China)
Tegus, O. (Inner Mongolia Normal University China)
Hanggai, W. (External organisation)
van Dijk, N.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) ORCID 0000-0002-2506-2852
Brück, E.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) ORCID 0000-0002-5063-3338
Guillou, F. (Inner Mongolia Normal University China)

Faculty

Mechanical, Maritime and Materials Engineering

 Date

2021

 Abstract

While rare-earth magnets exhibit unchallenged hard-magnetic properties, looking for alternatives based on inexpensive elements of non-critical supply remains of utmost interest. Here, we demonstrate that (Fe,Co)2(P,Si) single crystals combine a large magnetocrystalline anisotropy (K1 ≈ 0.9 MJ m−3 at 300 K), high Curie temperatures (TC up to 560 K) and an appreciable saturation specific magnetization (101 A m2 kg−1) leading to a theoretical |BH|max ≈ 165 kJ m-3, making them promising candidate materials as rare-earth-free permanent magnets. Our comparison between (Fe,Co)2P and (Fe,Co)2(P,Si) single crystals highlights that Si substitution reduces the low-temperature magnetocrystalline anisotropy, but strongly enhances TC, making the latter quaternary alloys most favorable for room temperature applications. Submicron-sized particles of Fe1.75Co0.20P0.75Si0.25 were prepared by a top-down ball-milling approach. While the energy products of bonded particles are to this point modest, they demonstrate that permanent magnetic properties can be achieved in (Fe,Co)2(P,Si) quaternary alloys. This work correlates the development of permanent magnetic properties to a control of the microstructure. It paves the way toward the realization of permanent magnetic properties in (Fe,Co)2(P,Si) alloys made of economically competitive Fe, P and Si elements, making these materials desirable for applications.


 Subject

Magnetic properties
Magnetism
Nanomaterials
Single crystal

 To reference this document use:

http://resolver.tudelft.nl/uuid:59e39aa0-02ec-43db-848d-bdf9f0e3f751

 DOI

https://doi.org/10.1016/j.actamat.2021.117388

 Embargo date

2023-10-20

 ISSN

1359-6454

 Source

Acta Materialia, 221

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2021 H. Yibole, B. Lingling-Bao, J. Xu, H. Alata, O. Tegus, W. Hanggai, N.H. van Dijk, E.H. Brück, F. Guillou
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