Abstract
A technique for growing α-Al2O3 crystals is described in which Na2O·11Al2O3 is dissolved in a liquid of composition Na2O·4TiO2·3Al2O3. Alpha Al2O3 is precipitated as Na2O evaporates from the system; Na2O·11Al2O3 serves as a source of Al2O3, and Na2O in the liquid. The content of solids in the mixture is always such that it does not melt completely. The size of the α-Al2O3 crystals grown is related to the Na2O content of the composition. Crystals as large as 4000 by 3000 μm in the α-axis direction and 500 μm in the c-axis direction have been grown.
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