The investigation of effective magnetic moments of Mn atoms and paramagnetic Curie temperatures, which characterize the fettle of magnetic subsystem (formed by Mn atoms) and can be defined from 1/χ_Mn = f(T), before and after thermal treatment, allow to judge about changes, which occur in the crystals of marganseinclusive solid solutions on the basis of А^ІІВ^VI in the process of thermal treatment.

The process of thermal treatment of semimagnetic solid solutions on the basis of mercury chalkogenide samples in the vapour of chalcogen leads to formation new or to change the sizes of clusters (nanoscale formation Mn-Se-Mn-Se, Mn-Te-Mn-Te, Mn-Te-Mn-S) which exist in the crystal. Increasing or decreasing the claster sizes determines the conditions of thermodynamic equilibrium in the crystals (that is accordance of cluster size to x composition). It leads to change of the effective magnetic moments of Mn atoms and of the paramagnetic Curie temperatures, which characterize the fettle of magnetic subsystem (which formed by Mn atoms). The increasing of thermal treatment continuance leads to improvement the homogeneity of cluster consistence in solid solution. The change of paramagnetism in investigated crystals afterward their thermal treatment in the Hg vapour occurs by such reasons: the change of cluster size, the change of Hg account in the junctions and interjunctions, the change of the charge carriers concentration and increasing of non-interactive between themselves Mn atoms.

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