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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。
Ho2 (Fe1-xCox) 15Al2 (x = 0,0.2,0.4,0.6,0.7,0.8,0.9,1.0) compounds were prepared by arc melting method. X-ray diffraction and magnetic measurements of their structure and magnetism. The experimental results show that all samples are single-phase 217-type Th2Ni17 hexagonal structure. With the increase of Co content, the unit cell volume V and the lattice constants a, c of Ho2 (Fe1-xCox) 15Al2 compound decrease linearly; Curie temperature Tc increases monotonically; the saturation magnetization firstly increases and then decreases, at x = 0. 2 to reach the maximum value. When x is less than 0.6, the compounds are all surface anisotropy. When x≥0.6, spin reorientation occurs at high temperature, which may be related to the preferential occupation of Co atoms.