ИСТИНА

R2Fe17 intermetallic compounds contain a large amount of iron that is why they possess maximum saturation magnetization among all binary compounds of the system R-T (R – rare earth, T – transition element). But they are not suitable for applications as permanent magnet materials because there are drawbacks. This work focusing first of all on the synthesis of substitutional Sm-Ho-Fe and Sm-Fe-Al alloys, hydrides, nitrides based on them. As part of a comprehensive study on the effect of combined substitutional-interstitial modification on the structure and magnetic properties of R2Fe17 compounds, all test samples has been studied X-ray diffraction (XRD) using Co Kα radiation and magnetic measurements. All starting alloys crystallize in the rhombohedral Th2Zn17-type structure, hydrides and nitrides preserve the same structure as the parents. Introduction of light atoms H and N into the crystal lattice results in an increase in lattice constants a and c, and the expansion of unit-cell volume is in case of aluminium-alloys approximately 3 and 5 % accordingly, in the holmium system - about 4 and 6 % respectively . Hydrogen and especially nitrogen absorption leads to an increase in saturation magnetization, coercive force to compare with the starting alloys.