NORMAL AND ZONE SOLIDIFICATION USING THE SUBMERGED HEATER METHOD

Using the submerged heater method, steady-state axial segregation may be reached by normal freezing and zone solidification. With solvent-so lute systems having equilibrium segregation coefficient k = 0.35 to 0. 5, diffusion-controlled steady-state was achieved by normal freezing. Steady-state segregation of dopants with k much less than 0.1 was reac hed by doping the shallow melt zone below the submerged heater (zone l eveling). These experimental findings are explained using a recently d eveloped analytical model of axial segregation.