CMI researchers at Ames Laboratory conducted the research for this highlight
Attained 9 MG-Oe energy product in Sm2Fe17N3 via development of low-temperature high-pressure Sm2Fe17 nitrogenation protocol that achieves full, 3 N atoms per formula unit - essential for permanent magnet performance. Determined that maximum solubility limit of La in Sm2Fe17 is 25 at.%
Significance and impact
- Criticality and cost: mostly Fe (~74% wt.%), and abundant, non-critical rare earths – Sm, La and Ce.
- Strong competitor to Nd-based magnets with comparable or better permanent magnet properties.
Details and next steps
Increase thermal stability by substitutions with La and/or Ce, as predicted by D. Parker at al., Phys. Rev. Appl., 2018, and/or doping with transition metals and p-block elements to enable consolidation by sintering