Аннотация:In this paper presents the results of the temperature dependence study of the ACsusceptibility of the multicomponent system Sm0.2(Tb1-xYx)0.8Fe2 alloys in the Curie temperaturerange. The substitution parameter in the system takes the values x = 0, 0.2, 0.4, 0.6, 0.8, 1. The systemreplaces magnetic terbium atoms with weakly magnetic samarium and non-magnetic yttrium. It isknown that by varying the concentration of components, temperature, and external fields, it ispossible to successfully influence competing exchange interactions that lead to unique phenomena inthe phase transformations region. Therefore, the main goal in this work was to determine thetemperature of the magnetic phase transition of of this system alloys from the temperaturedependence of the susceptibility in the Curie temperature region. It is shown that the Curietemperatures of the alloys of this system lie in the high temperature range.