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2000

Faculty Publications from Nebraska Center for Materials and Nanoscience

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Full-Text Articles in Nanoscience and Nanotechnology

Order–Disorder Effects In Nitrided Sm–Fe Permanent Magnets, B.E. Meacham, Jeffrey E. Shield, D.J. Branagan May 2000

Order–Disorder Effects In Nitrided Sm–Fe Permanent Magnets, B.E. Meacham, Jeffrey E. Shield, D.J. Branagan

Faculty Publications from Nebraska Center for Materials and Nanoscience

Rapidly solidified Sm11Fe89 was observed to form partially ordered Sm2Fe17. The ordering increased systematically with annealing temperature, reaching an order parameter of 0.8 after annealing at 950 °C for 15 min. The coercivity of the corresponding interstitial compound Sm2Fe17Nx varied with annealing temperature and thus order parameter. The coercivity reached a maximum for an order parameter of 0.45–5, then dramatically decreased as the order increased. This behavior is characteristic of demagnetization controlled by domain wall pinning by antiphase boundaries.


Phase Formation In Hypostoichiometric Sm2Fe17 Alloys Modified With Ti And C, Jeffrey E. Shield, B.E. Meacham Feb 2000

Phase Formation In Hypostoichiometric Sm2Fe17 Alloys Modified With Ti And C, Jeffrey E. Shield, B.E. Meacham

Faculty Publications from Nebraska Center for Materials and Nanoscience

The phase formation, crystallization products, microstructure, and magnetic behavior of Fe-rich Sm–Fe alloys modified with Ti and C have been determined. Alloys of nominal composition (Sm 0.11-xFe 0.89+x) 94Ti 3C 3 with x=0, 0.02, and 0.04 were produced by melt spinning. Crystalline phases observed included SmFe 7 and α -Fe and an increasing amorphous fraction was observed with increasing x. Upon crystallization the amorphous fraction converted to Sm2Fe17 and a-Fe, with a grain size of 30 nm for the sample with x=0.02. The magnetic ...