We employed machine-learning of a dataset extracted from literature on Sm(Fe,X)12-based alloys to understand the most influential parameters for coercivity. V-addition is found to be most influential to coercivity. The microstructure origin for coercivity in SmxFe11Ti and SmxFe10TiV (1.0≤x ≤ 2.1) melt-spun ribbons was investigated experimentally. Unlike V-free alloys, ThMn12-type structure can be stabilized in a wide range of x =1.03-1.62 in SmxFe10TiV ribbons. Coercivity increases from 0.51 T for Sm0.99Fe11Ti to 1.1 T for Sm1.06Fe10TiV optimally-annealed ribbons. The enhanced coercivity originates from formation of a Sm-enriched intergranular phase enveloping the SmFe12-based grains, increasing pinning force against the magnetic domain-wall propagation.
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