The structural and magnetic properties of the Er2Fe15M2 compounds with M = Mn, Fe, Ni, Al, Ga and Si have been studied. X-ray diffraction and thermomagnetic curve measurements show that all compounds crystallize in the Th2Ni17-type of structure. The X-ray diffraction patterns of the aligned samples indicate that at room temperature all compounds have planar anisotropy. The effects of the substitution for Fe of various elements on the magnetic properties such as Curie temperature and spontaneous magnetization are discussed. Substitution of Ni for Fe leads to the strongest increase of T-c and the smallest decrease of M-T The magnetocrystalline anisotropy of these compounds has been investigated. (C) 1998 Elsevier Science B.V. All rights reserved.
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