  Peritectic growth of bulk superconducting cuprate perovskite, like
YBa2Cu3O7-x has been studied. The microstructure features are recalled. The
simplest model giving the best description of the microstructure complexity at
the mesoscopic scale is an Eden model adapted to chemical reactions. A
repulsive dynamical interaction between the front and the solid 211 particles,
rejected by the solidifying matrix, is also taken into account. A growth
probability-with chemical reaction and pushing-transfer matrix method is
developed. The simulations put into evidence the effect of the initial 211 size
distribution on the microstructure.
