Magnetic properties of Gd x Y 1- x Co 2 with x ≦0.2 were studied by means of magnetic, thermal expansion and forced magnetostriction measurements. Spontaneous magnetization disappears for x ≦0.15. Maxima of magnetization were observed for 0.05 ≦ x ≦0.175 in the thermomagnetic curves at 100 Oe. Negative volume changes on the application of a magnetic field were detected for all samples except for x =0.15, where a positive volume change was observed at low fields. These results are ascribed to magnetic cluster glasses.
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Muraoka et al. (1984) studied this question.
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