Abstract
Sm 2(Fe 1 − x Ti x ) 17 alloys ( x=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 2(Fe 1 − x Ti x ) 17 alloys have different main phases including Sm 2(Fe,Ti) 17 with Th 2Zn 17-type for x=0–0.04, Sm 3(Fe, Ti) 29 with Nd 3(Fe,Ti) 29-type for x=0.06, and Sm(Fe,Ti) 12 with ThMn 12-type for x=0.08–0.1. Curie temperature T c of the main phase of the alloys increases from 125°C for x=0 to 318°C for x=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°C. The hydrogenation at 800°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°C and by 140–350°C due to lattice expansions, respectively. The magnetic properties achieved for the Ti-containing alloys and their nitrides are lower than those of Sm 2Fe 17N δ prepared by the same processes of HD and HDDR.
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