Crystal structure and hard magnetic properties of TbCu_7-type Sm_(0.98)Fe_(9.02–x)Ga_x nitrides  

作　　者：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 

机构地区：[1]National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co., Ltd.

出　　处：《Journal of Rare Earths》2014年第8期722-726,共5页稀土学报（英文版）

基　　金：supported by International Science and Technology Cooperation Project(2010 DFB53520);the National High Technology Research and Development Program of China(2011AA03A402)

摘　　要：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 ℃）. The optimum 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 of α-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.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 ℃）. The optimum 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 of α-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.

关 键 词：rapid-quenching SmFeGa alloy TbCu7-type structure rare earths 

分 类 号：TM273[一般工业技术—材料科学与工程]