Crucible With Convex Inward Bottom For Oxide Crystal Growth
Original Publication Date: 1979-Jun-01
Included in the Prior Art Database: 2005-Feb-20
Digital simulation studies indicate that a conventionally shaped crucible 10 (Fig. 1) used to grow single crystals by the Czochralski method causes an eddy or vortex 12 over the center of the bottom of the crucible in the melt 13. The large eddy 14 is driven by thermal convection, and a small eddy 16 is driven by the rotating crystal. Impurities of the melt tend to concentrate in the vortex 12, which is a back-eddy driven by the thermal eddy 14.