摘要
用电弧熔炼的方法制备了Ｈｏ２（Ｆｅ１－ｘＣｏｘ）１５Ａｌ２（ｘ＝０，０．２，０．４，０．６，０．７，０．８，０．９，１．０）化合物，用Ｘ射线衍射和磁性测量研究了它们的结构和磁性。实验结果表明所有样品都为单相２１７型Ｔｈ２Ｎｉ１７六角结构。随Ｃｏ含量的增加，Ｈｏ２（Ｆｅ１－ｘＣｏｘ）１５Ａｌ２化合物的单胞体积Ｖ，晶格常数ａ、ｃ线性下降；居里温度Ｔｃ单调上升；饱和磁化强度先升高后下降，在ｘ＝０．２时达到极大值。当ｘ＜０．６时，化合物均为面各向异性；当ｘ≥０．６时，化合物在高温下出现自旋重取向现象，这可能与Ｃｏ原子的择优占位有关。
The Ho 2( Fe 1-x Co x ) 15 Al 2( x =0,0.2,0.4,0.6,0.7,0.8,0.9,1.0)compounds were prepared by arc melting.The structure and magnetic properties have been studied by means of X ray diffraction and magnetization measurements.The experimental results show that all samples are single phase compounds with hexagonal Th 2Ni 17 type structure.It was found that the unit cell volume V and the lattice parameters a,c of Ho 2( Fe 1-x Co x ) 15 Al 2 compounds decreases, and the Curie temperature T c increases monotonically with increasing Co concentration.The saturation magnetization M s increases with x and then decreases,attaining maximum at x =0.2.At higher temperature,the magnetocrystalline anisotropy changes from easy planar anisotropy to easy axial one with increasing Co concentration,exhibits spin reorientation at x 0.6,which may be due to the preferential site occupation of Co atom.
出处
《磁性材料及器件》
CAS
CSCD
1999年第1期17-22,27,共7页
Journal of Magnetic Materials and Devices
关键词
结构
磁性
稀土
金属间化合物
钬
铁
Ho 2( Fe 1-x Co x ) 15 Al 2 compound, structure, magnetic property
