Structure and magnetic properties of Sm{sub 2}(Fe,Mn){sub 17}N{sub x} coarse powders with high coercivity
- Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1, Yamadaoka, Suita Osaka 565 (Japan)
The influence of a substitution of Mn for Fe in the Sm{sub 2}(Fe,Mn){sub 17}N{sub x} alloys on the structure and the magnetic properties was studied. Sm{sub 2}(Fe,Mn){sub 17}N{sub x} alloy powders of 32{endash}74 {mu}m in particle size with several values of {ital x} were successively synthesized using NH{sub 3}+H{sub 2} gas. It was found that the primary phase of the powders maintained the Th{sub 2}Zn{sub 17}-type structure in the wide range for 0{lt}x{lt}6. On the other hand, the coercivity of the powders remarkably increased for x{gt}3. The Sm{sub 2}(Fe{sub 0.95}Mn{sub 0.05}){sub 17}N{sub 5} powder proved to have a coercivity of 0.62 MA/m (7.7 kOe), without a fine grinding. Microstructural analysis by transmission electron microscopy and energy-dispersive x-ray analysis revealed the powder consisted of Sm{sub 2}(Fe,Mn){sub 17}N{sub 3} nanocrystalline grains of 10{endash}30 nm in diameter surrounded by Mn-enriched amorphous phase. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496490
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016187
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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