The Intra‐ and Intersublattice Exchange Interactions in RFe 12 x T x Intermetallics

The experimental values of Curie temperatures of RFe 12− x T x (R = rare earth, T = V, Ti, Si, Cr) are used to calculate the effective exchange coupling constants in iron sublattice and between rare earth and iron sublattices. A mean field approximation is used. Values of molecular field, B mol , acting on the rare earth ion are also established. The coupling constant in Fe sublattice is found to be the largest for T = V; J FeFe = 10.14 × 10 −22 J. The molecular field has its maximum value for R = Sm in each series of RFe 12− x T x compounds.