Random field based model of mixed ferroelectrics phase diagram
  The equations for phase transitions temperatures, order parameters and critical concentrations of components have been derived for mixed ferroelectrics. The electric dipoles randomly distributed over the system were considered as a random field sources. We derive a random field distribution function for different orientations of the electric dipoles with nonlinear and spatial correlation effects included. 
M.D.Glinchuk, E.A.Eliseev (Institute for Problems of Materials   Science, NASc of Ukraine,Kiev, Ukraine) V.A.Stephanovich (I...