ИСТИНА

Compounds of rare earth metals (R) with iron form a fairly large class of materials widely known not only in science but also in practice. Compositions of the RFe2 type with the structure of Laves phases are of particular interest to scientists due to their simple crystal and magnetic structure, as well as due to unique magnetic properties, such as giant magnetostriction, a large magnetocaloric effect, etc., which are observed in the region of spontaneous and induced by an external magnetic field spin-reorientation phase transitions. Moreover, RFe2 compounds easily absorb hydrogen, forming both stable and unstable hydrides. The purpose of this work was to study the effect of hydrogenation on magnetic phase transitions in the GdFe2 compound, as well as to control the stability of the resulting hydrides over time. Different interstitials have different sizes. Hydrogen atoms, located in interstitials, have in their environment a different number of nearest neighbors, both gadolinium atoms and iron atoms. Using the molecular field theory, the parameters of the intersublattice exchange interaction for hydrides GdFe2Hx are determined.