MAGNETIC FRUSTRATION IN INFINITE HEISENBERG CUBIC FERRIMAGNETS

0K Magnetic configurations are discussed in the case of infinite ferri magnetic cubic systems, without accounting for quantum fluctuations ef fects. Two kinds of magnetic frustrated configurations originating a m agnetic phase transition, were evidenced according to the values of ex change interactions between first (J(AB)(lv)) and second (J(AA(BB))(2v )) nearest neighbours. We report on the evolution of the constraint fu nction F-c, versus ratio J(AA)(lv)/J(AA(BB))(2v), for each set of valu es (S-1, S-2), and the use of present graphic representation in order to predict some 0K magnetic configurations.