HABIT CHANGES OF SAPPHIRE GROWN FROM PbO-PbF2 AND MoO3-PbF2 FLUXES.
Rept. for Jul 67-Apr 68,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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Single crystals of Al2O3 sapphire were grown from both PbO-PbF2 and MoO3-PbF2 fluxes. Their habits varied from flat plates PbF2-rich melts to equidimensional crystals PbO- or MoO3-rich melts. The primary growth planes on these crystals are basal planes 0001, first-order rhombs 10-11, and second-order rhombs 01-12. The habit change is interpreted on the basis of F1- crystal contamination and Pb2 surface adsorption. Possible ion species in the melt and their relative importance on crystal growth from these melt systems are discussed. Author