| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1600728 | Intermetallics | 2011 | 7 Pages |
The aim of this work was the fabrication of Nd2Fe14B nanoparticles, through a “top-down” technique like surfactant-assisted high-energy ball-milling, and the monitoring of the milling-process stages with respect to the structure and magnetism. The ball-milling of a 40 μm powder under Ar atmosphere, in an organic solution of oleic acid/oleylamine, resulted in 15 nm isolated nanoparticles after 20 h, presenting improved magnetocrystalline anisotropy compared to the initial material. By extending the mechanical process up to 100 h a gradual formation of elongated nanoparticles followed by structural amorphization was observed.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Monitoring of surfactant-assisted ball-milling process for Nd2Fe14B nanoparticles.► Milling time and surfactants determine the size, shape, structure and magnetism.► Optimum energy product is achieved in the size range 50–100 nm.► Particles are isolated at sizes lower than 20 nm after 15 h of milling.► Further treatment affects the shape and the crystallinity.
