Abstract
The random-bond mixture of the Ising model on the FCC lattice is treated by the tetrahedron approximation. The phase diagram of the binary mixture of the ferromagnetic (F) and antiferromagnetic (AF) bonds are determined. The phase diagram of the ternary mixture of F, AF and the non-magnetic (N) bonds is also calculated by the simple version of the tetrahedron approximation. It is shown that they have the paramagnetic, ferromagnetic and spin glass (G) phases. In particular it is shown that the diluted antiferromagnet has no AF phase but a G phase. The phase diagram of the binary mixture is qualitatively similar to those for EuxSr1-xS, Co(SxSe1-x)2 and (Ti1-xVx)2O3.

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