Peculiarities of heat transfer in Czohralski oxide growth are considered. Conjugate heat transfer in crystal, melt and crucible are studied numerically as applied to growth of BGO crystals by low thermal gradient method. Emphasis is placed on the accurate treatment of radiative heat transport inside and outside the crystal. The dependence of heat transfer and flow patterns on crystal length is studied and the possible reasons of violation of the fully faceted growth at the initial stage of pulling are discussed. It is shown that specular reflection at the upper conical part of crystal strongly increases the heat removal from the crystallization front by radiation. Special attention is given to the effect of the refraction index of the crystal.
展开▼
