FLOATING-ZONE OF GAAS AND EFFECT OF LIQUID ENCAPSULATION

In the present paper, liquid encapsulated floating zone melting of GaA s is modelled numerically. The system consists of two coaxial liquid c olumns (GaAs and B2O3) and are confined by the ampoule. The effect of encapsulation on capillary stability of the liquid bridges is investig ated. Marangoni convection in GaAs melt is considerably reduced with t he presence of encapsulant, and this effect is also studied with arbit rary viscosity ratio of encapsulant to melt. The results show that thi s ratio plays a dominant role in controlling the convection in melt. M aximum interfacial velocity decreases asymptotically to zero as the vi scosity ratio increases.