Magnetic systems have occupied the central position for the explanation most of physical phenomena, however, there is no significant progress in the development of new materials for permanent magnets in the last years. The researchers try to improve the properties of the known before phases but do not find the really novel compounds. For example, these are investigations on the R₂Fe₁₇-based solid solutions with Th₂Zn₁₇ structure. In other words, progress in magnetism is limited by internal magnetic properties of existing magnetic materials. For the qualitatively new “jump” it is necessary to carry out searching of new compounds with magnetic properties, based on which it is possible to make new materials. It is carrying out insufficiently today.

The efforts necessary to make for adding any new series of magnetic intermetallics must be considered presently. For the successful solution of these tasks it is necessary to create the methodological approach, which must be based on physico-chemical character of component interaction in known binary and ternary systems and, principally, on crystal-chemical analysis – generalization of structure types with unit-axial direction, prediction of phases’ formation of these types, etc.

The main idea is searching for a new group of multi-component compounds based on Fe(Co) and Rare Earths, which have no similarity among known binary and ternary compounds and can be used as basic for new permanent magnets’ materials. Despite of the fact that in R-Fe(Co)-X (X – p-element) systems the iron(cobalt)-rich compounds with unit-axial tetragonal ThMn₁₂, BaCd₁₁ and CeNi_8.5Si_4.5 structures are not known (except for some cases), one can expect an existence of the phases with such structure in multicomponent R-Fe(Co)-X-X` systems. These compounds would possess high-performance magnetic properties with very high level of probability.

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1. THE CRYSTAL STRUCTURE AND SOME MAGNETIC PROPERTIES OF NdFe₈Ga₃C COMPOUND