  The magnetic phase diagram at zero external field of an ensemble of dipoles
with uniaxial anisotropy on a FCC lattice has been investigated from tempered
Monte Carlo simulations. The uniaxial anisotropy is characterized by a random
distribution of easy axes and its magnitude $\lambda_u$ is the driving force of
disorder and consequently frustration. The phase diagram, separating the
paramagnetic, ferromagnetic and spin-glass regions, was thus considered in the
temperature, $\lambda_u$ plane. Here we interpret this phase diagram in terms
of the more convenient variables namely the bare dipolar interaction and
anisotropy energies $\epsilon_d$ and $\epsilon_u$ on the one hand and the
volume fraction $\Phi$ on the other hand and compare the result with that
corresponding to the random distribution of particles in the absence of
anisotropy. We also display the nature of the ordered phase reached at low
temperature by the ensemble of dipoles on the FCC lattice in terms of both the
dipolar coupling and the texturation of the easy axes distribution when the
latter is no more random. This system is aimed at modeling the magnetic phase
diagram of supracrystals of magnetic nanoparticles.
