  We perform a thorough study of an extended Hubbard model featuring local and
nearest-neighbor Coulomb repulsion. Using dynamical mean-field theory we
investigated the zero temperature phase-diagram of this model as a function of
the chemical doping. The interplay between local and non-local interaction
drives a variety of phase-transitions connecting two distinct charge-ordered
insulators, i.e., half-filled and quarter-filled, a charge-ordered metal and a
Mott insulating phase. We characterize these transitions and the relative
stability of the solutions and we show that the two interactions conspire to
stabilize the quarter-filled charge ordered phase.
