Abstract
Float zone crystal growth of Bi 12GeO 20 under terrestrial and microgravity conditions has been modeled by numerical simulation using the finite element technique. A three-dimensional asymmetrically heated molten rod model is developed to obtain a quantitative estimate of the Rayleigh and Marangoni convection. The free surface deformation resulting from the combined effect of viscous, gravitational and capillary forces as a function of the temperature difference is reported. The temperature distribution and the flow behavior in the float zone were examined for various asymmetrical heating conditions. The results showed that nonuniform heating in the axial direction is a critical parameter for the growth of Bi 12GeO 20 by the float zone technique.
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