Ferrimagnetism and compensation points in a decorated 3D Ising models

We give a precise numerical solution for decorated Ising models on the simple cubic lattice which show ferromagnetism, compensation points, and reentrant behaviour. The models, consisting of spins on a simple cubic lattice, and decorating S=1 or spins on the bonds, can be mapped exactly onto the normal spin- Ising model, whose properties are well known.