CMI scientists at Ames Laboratory conducted this research.
Demonstrated that mechanochemical preprocessing (MP) is beneficial for nitrogen insertion/topotactic extraction. Achieved effective 98+% yields of ordered t-FeNiN (precursor phase to L10 FeNi) and 1.2 kOe coercivity (comparable to Alnico) in Ni-rich L10 phase Fe45Ni55.
Significance and impact
Achievement of significant coercivity important step towards high-performance, rare earth-free, low-cost magnet
Quantitative topotactic extraction at T << 250 °C to yield 95-98% yield of L10-FeNi, followed by scale-up to ~1 – 10 g quantities of L10-FeNi, IP disclosure, and the synthesis of permanent magnets