Synthesis and magnetic properties of Gd-3 (Fe, Co, Cr)(29) compounds

Formation and magnetic properties of the Gd3Fe29-x-yCoxCry compounds have b een investigated. It has been found that formation of single-phase compound s Gd3Fe29-x-yCoxCry with the Nd-3(Fe,Ti)(29)-type structure depends strongl y on the content of the stabilizing element Cr, and the solid-solution limi t of Co in Gd3F29-x-yCoxCry compounds increases with Cr content. Pure Go-ba sed Gd3Coas-,Cr, compounds with the Nds(Fe,Ti)ne-type structure have been s uccessfully synthesized with, y = 6.5 and 7.0. The Curie temperature Te of Gd3Fe29-x-yCoxCry compounds increases with increasing Cr content x at fixed y, whereas the increase of the Cr content leads to an obvious decrease of T-C of the Gd3Co29-yCry compounds. Composition dependence of the saturation magnetization at 5K reaches a maximum around a: = 7.5 and y = 4. It is wor th noting that substitution of Co for Fe results in a significant change of magnetocrystalline anisotropy of the Gd3F29-x-yCoxCry compounds and change s the easy magnetization direction from basal-plane to easy-axis when z > 1 0 and y = 4.