Polycrystalline samples of the cubic Sm x Y 2−x O 3 solid solutions (x=0.2, 0.5, 1.0, 1.4, 1.7 and 2.0) were prepared and analyzed by the XRD and magnetic susceptibility measurements. Random distribution of Sm 3+ ions between 24d and 8b site was found, except for diluted samples (x=0.2 and 0.5), where Sm 3+ ions preferentially occupy 24d site. The susceptibility data was analyzed within 2–150K range according to the second order perturbation (Van Vleck equation). The strength of exchange interactions was estimated from low-temperature susceptibility within 2–20K (effective g-value and Curie–Weiss temperature). The effective g-value and the Curie–Weiss temperature θ for Sm 2 O 3 were found to be 0.451 and −3.97K, respectively.