Structural and magnetic properties of Sm sub(2)(Fe sub(1-x)Ti sub(x)) sub(17) (x identical with 0-0.1) alloys prepared by hydrogenation processes and their nitrides

• Published in: Journal of magnetism and magnetic materials 2000-01, Vol.208 (3), p.231-238
• Main Authors: Zhao, Xin-guo, Zhang, Zhi-dong, Sun, X K, Liu, Wei, Guo, Zhi-jun, Xiao, Qun-feng, Geng, Dian-yu
• Format: Article
• Language: English
• ISSN: 0304-8853

Sm sub(2)(Fe sub(1-x)Ti sub(x)) sub(17) alloys (x identical with 0, 0.02, 0.04, 0.06, 0.08, 0.1) were prepared by arc-melting, subsequently annealing, hydrogenation and nitrogenation processes. The phase components, structures and magnetic properties involved in the processes have been investigated systematically. The Sm sub(2)(Fe sub(1-x)Ti sub(x)) sub(17) alloys have different main phases including Sm sub(2)(Fe,Ti) sub(17) with Th sub(2)Zn sub(17)-type for x identical with 0-0.04, Sm sub(3)(Fe, Ti) sub(29) with Nd sub(3)(Fe,Ti) sub(29)-type for x identical with 0.06, and Sm(Fe,Ti) sub(12) with ThMn sub(12)-type for x identical with 0.08-0.1. Curie temperature T sub(c) of the main phase of the alloys increases from 125 degree C for x identical with 0 to 318 degree C for x identical with 0.1. The corresponding hydride phases similar to the main phase structures of the parent alloys were formed after a hydrogen decrepitation (HD) process at 300 degree C. The hydrogenation at 800 degree C mainly shows a hydrogenation-disproportionation-desorption-recombination (HDDR) process. The HD and nitrogenation resulted in the Curie temperature increments of alloys by 30-150 degree C and by 140-350 degree C due to lattice expansions, respectively. The magnetic properties achieved for the Ti-containing alloys and their nitrides are lower than those of Sm sub(2)Fe sub(17)N sub( delta ) prepared by the same processes of HD and HDDR.