  Spinodal decomposition process in the system of immiscible PbTe/CdTe
compounds is analyzed as an example of a self-organizing structure. The
immiscibility of the constituents leads to the observed morphological
transformations like anisotropy driven formation of quantum dots and nanowires,
and to the phase separation at the highest temperatures. Proposed model
accomplishes bulk and surface diffusion together with the anisotropic mobility
of material components. We analyze its properties by kinetic Monte Carlo
simulations and show that it is able to reproduce all of the structures
observed experimentally in the process of PbTe/CdTe growth. We show that
studied mechanisms of dynamic processes play different role in the creation of
zero--, one--, two-- and finally three-dimensional structures. The shape of
grown structures is different for relatively thick multilayers when bulk
diffusion cooperates with the anisotropic mobility, in annealed structure when
isotropic bulk diffusion only decides about the process and finally for thin
multilayers when surface diffusion is the most decisive factor. We compare our
results with experimentally grown systems and show that proposed model explains
the diversity of observed structures.
