Magnetization measurements of single crystal spheres of Y, Ce, Pr, Nd and SmCo5 compounds yield the magnetic moment per formular unit 7.9, 6.6, 10.4, 10.4 and 7.7 µB, respectively. The anisotropy constants K1 (0) and K2 (0) at 0 °K estimated from the K1 and K2 vs temperature curves measured are 6.5 and ~ 0, 5.5 and ~ 0, - 7 and 18, - 40 and 19, 10.5 and ~ 0 (x 107 ergs.cm-3) for the above compounds, respectively. Linear variation of K1 (0) and K2 (0) with x obtained in Y1-xNdxCo5 gives evidence in support of single ion model.
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Tatsumoto et al. (1971) studied this question.