1. Microstructure and magnetic properties of Sm2(Fe1 − xGax)17 and nitrides
- Author
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Fubiao Li, Run Wang, Yi Lin, Guobiao Lin, Shouzeng Zhou, Limin Chai, Xiaowei Wu, Maocai Zhang, Youxiang Yin, and Shenjun Yu
- Subjects
Materials science ,Mechanical Engineering ,Metals and Alloys ,chemistry.chemical_element ,Crystal structure ,Nitride ,Microstructure ,Crystallography ,Magnetization ,chemistry ,Electron diffraction ,Mechanics of Materials ,X-ray crystallography ,Materials Chemistry ,Curie temperature ,Gallium - Abstract
The crystal structure and microstructure of Sm 2 (Fe 1 − x Ga x ) 17 ( x = 0−0.12) have been studied by X-ray diffraction and scanning electron microscopy analysis techniques. Results indicate that the alloys have a single phase with Th 2 Zn 17 -type structure for x ⩽ 0.02; when x = 0.05−0.12, two phases, namely Sm 2 (Fe, Ga) 17 and (Ga, Fe)Sm, exist and, the higher the gallium substitution the more (Ga, Fe)Sm phase occurs. The lattice parameters increase with Ga addition. The Curie temperature and saturation magnetization of the nitrides decrease with increasing gallium substitution; however, the anisotropy field reaches a maximum value of 18.4 T for x = 0.02 at room temperature. The hard magnetic properties of the nitrides decrease also except for x = 0.02. The optimum hard magnetic properties obtained are B r = 12.3 kG, i H c = 10.0 kOe and ( BH ) max = 26.2 MG Oe with x = 0.02. The thermomagnetic curves measured of all the nitrides have shown that the onset decomposition temperatures are 760–780 K, which are slightly affected by gallium substitution.
- Published
- 1995
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