| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnetics and the Critical Materials Challenge: An FMD Symposium Honoring Matthew J. Kramer
|
| Presentation Title |
Synthesis and Stabilization of Magnetic Nanoparticles of Rare-earth Metal Alloys |
| Author(s) |
Shouheng Sun |
| On-Site Speaker (Planned) |
Shouheng Sun |
| Abstract Scope |
We report our recent studies on the synthesis and stabilization of strongly ferromagnetic NPs of REM alloys of SmCo and SmFeN. Our synthesis started with the preparation of composite NPs of CoO + Sm2O3 (denoted as SmCo-O) within one nanostructure. These SmCo-O NPs were then coated with polydopamine (PDA) and thermally annealed to convert the PDA to N-doped graphitic carbon (NGC). The SmCo-O/NGC NPs were further reduced by Ca at 850°C to give SmCo5/NGC NPs. The 10 nm NGC coating efficiently stabilized the SmCo5 NPs against air oxidation: the magnetic moment of the 180 nm SmCo5/NGC NPs was stabilized at 86.1 emu/g after their air exposure at room temperature for five days, and their Hc reached 51 kOe at 150 K and 22 kOe at 330 K. The method could be easily extended to synthesize Sm2Co17 NPs and Sm2Fe17N3 NPs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Nanotechnology, Surface Modification and Coatings |