Abstract
The experimental values of Curie temperatures of hexagonal R 2Co 7B 3 (R = heavy rare earth) compounds are used to calculate the effective intersublattice exchange interactions, J RCo, between R and Co sublattices. A mean field approximation is used. The compounds belong to the R n+1 Co 3 n+5 B 2 n family. The R 2Co 7B 3 is a combination of CaCu 5 and CeCo 3B 2-type structures. The J RCo has a tendency to decrease with increasing atomic number of the rare earth partner. A similar tendency has been found for other Fe and Co-based compounds.
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