Structural and magnetic properties of Sm-3(Fe,Ti)(29) and Sm-3(Fe,Ti)(29)X-y (X = H, N) compounds

Abstract

Abstract: The alloy with nominal composition Sm-2(Fe0.94Ti0.06)(l7) is prepared by are-melting, hydrogenation and nitrogenation processes. The Sm-2(Fe0.94Ti0.06)(17) alloy has a single phase of Sm-3(Fe, Ti)(29) with the Nd-3(Fe, Ti)(29)-type structure. The corresponding hydride phase with the same phase structure of the parent alloy was formed after a hydrogen decrepitation (HD) process at 300 degrees C. The hydrogenation at 800 degrees C mainly shows a HDDR process. The HD and nitrogenation at 500 degrees C result in increasing the Curie temperature of the alloy by 72 degrees C and by 158 degrees C due to lattice expansions, respectively. The anisotropic and isotropic Sm-3(Fe, Ti)(29)Ny magnets are obtained after HD, HDDR and the consequent nitrogenation, respectively. The optimum magnetic properties of Sm-3(Fe, Ti)(29)Ny powders achieved in the above two processes are: (i) B-r=0.82 T, H-i(c)=4.48 kA/cm, (BH)(max)=54.3 kJ/m(3), (ii) B-r=0.68 T, H-i(c)=8.14 kA/cm, (BH)(max)=66.4 kJ/m(3).

Key words:

Xinguo ZHAO, Zhidong ZHANG, Zhijun GUO, Wei LIU, Dianyu GENG, Baozhi CUI. Structural and magnetic properties of Sm-3(Fe,Ti)(29) and Sm-3(Fe,Ti)(29)X-y (X = H, N) compounds[J]. J Mater Sci Technol, 2000, 16(02): 123-124.

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Structural and magnetic properties of Sm-3(Fe,Ti)(29) and Sm-3(Fe,Ti)(29)X-y (X = H, N) compounds

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