  The phenomenon associated with inhomogeneous distribution of electron density
is known as a charge ordering. In this work, we study the zero-bandwidth limit
of the extended Hubbard model, which can be considered as a simple effective
model of charge ordered insulators. It consists of the on-site interaction $U$
and the intersite density-density interactions $W_1$ and $W_2$ between
nearest-neighbors and next-nearest neighbors, respectively. We derived the
exact ground state diagrams for different lattice dimensionalities and discuss
effects of small finite temperatures in the limit of high dimensions. In
particular, we estimated the critical interactions for which new ordered phases
emerge (laminar or stripe and four-sublattice-type). Our analysis show that the
ground state of the model is highly degenerated. One of the most intriguing
finding is that the nonzero temperature removes these degenerations.
