Magnetization and ac susceptibility measurements have been performed on TbxY1-xCo2
compounds. Samples with x > 0.1 order ferromagnetically below room temperature. The cobalt magnetic
moments in these compounds are induced by the internal magnetic field exerted by the terbium moments on
the cobalt atoms. The ac susceptibility measurements indicate a change from second order to first order in
the ferromagnetic transition for samples with x-values equal or smaller than 0.5. ?? 1983.
