Abstract
The results of magnetic measurements performed on (Gd x Y 1- x )Co 4B compounds in the temperature range 4.2 and 900 K are reported. The compounds with x ⩾ 0.2 are ferrimagnetically ordered. The mean cobalt moment is dependent on composition. Above the Curie temperatures, the reciprocal susceptibilities obey a non-linear dependence as function on temperature. By using a two sublattices model, the mean values of the molecular field coefficients, characterizing the magnetic interactions inside and between sublattices are determined. The mean cobalt moments are linearly dependent on the exchange fields acting on these atoms.
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