Abstract
The structure and magnetic properties of arc-melted Dy 2Co 17− x Ga x compounds were studied. These compounds have the hexagonal Th 2Ni 17-type structure for 0≤ x≤3 and the rhombohedral Th 2Zn 17-type structure for 3≤ x≤6. The unit cell volume shows an approximately linear increase at a rate of about 7.7 Å 3 per Ga atom. The Curie temperature was found to decrease with increasing Ga concentration. The saturation magnetization decreases linearly with increasing Ga content from 7.0 μ B f.u. −1 for x=0 to −7.9 μ B f.u. −1 for x=6. The exchange coupling constants J DyCo and J CoCo have been derived by analyzing both the field dependence and the temperature dependence of the magnetization. An approximately constant value of J DyCo indicates that the substitution of Ga for Co has only a small influence on the exchange coupling between the Dy and Co atoms. The effect of Ga substitution on J CoCo is strong, leading to a linear decrease of T C in the Dy 2Co 17− x Ga x compounds.
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