Abstract
The effects of boron doping on the microstructure and magnetic properties of Sm(Fe0.8Co0.2)11TiBx melt-spun ribbons were investigated. At a quenching speed of 25 m/s, the Ti-rich grain boundary (GB) phase and more percent of SmFe12 phase was formed in the sample with x = 0.25, which increase the coercivity from 3 kOe to 6 kOe and remanence from 61 emu/g to 75 emu/g. The Ti-rich grain boundary phase show TiFe2-type structure, in which the (02–1) plane spacing of the grain boundary phase is half that of the adjacent (020) plane spacing of ThMn12 phase. Electron holographic analysis showed that the Ti-rich GB phase can reduce the magnetization coupling between the SmFe12 main phase grains. This served as a guide for the further fabrication of the GB phase in SmFe12-based permanent magnetic materials with high magnetic properties.
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