稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
8期
722-726
,共5页
权宁涛%张世荣%于敦波%李扩社%罗阳%靳金玲%张坤%刘宇超%李红卫
權寧濤%張世榮%于敦波%李擴社%囉暘%靳金玲%張坤%劉宇超%李紅衛
권저도%장세영%우돈파%리확사%라양%근금령%장곤%류우초%리홍위
rapid-quenching%SmFeGa alloy%TbCu7-type structure%rare earths
The compound Sm0.98Fe9.02-xGaxNδ(x=0, 0.25, 0.5, 0.75, 1) were prepared by melt-spun method and subsequent annealing and nitriding. The Rietveld analysis showed that the lattice expansion played an important role in improving the Curie temperature. An obvious development of the Curie temperature was obtained with the increased Ga content from x=0-1 (ΔTc=90 oC). The opti-mum coercivity of nitrides was obtained at x=0.25 with the value Hcj=652 kA/m (8.15 kOe) after annealing, which corresponded to a reasonable distribution of grain sizes of both TbCu7-type SmFe9Nδandα-Fe. However, an excess of Ga doping might lead to an ab-normal growth ofα-Fe, which in turn deteriorated the magnetic properties. It was concluded that a moderate Ga content was very ef-fective in raising the coercivity and Curie temperament in the TbCu7-type Sm-Fe-N.
