| 摘要 |
PURPOSE:To prepare a single crystal contg. no defect, particularly, no foam by using specified alumina as a starting material for melt, wherein said specified alumina is prepd. by hydrolyzing aluminium alkoxide by the sol-gel method at specified temp. range and heat-treating obtd. hydrolyzate at high temp. CONSTITUTION:Specified alumina used as a starting material for melt for the growth of a single crystal is prepd. by hydrolyzing aluminium alkoxide by the sol-gel method using HCl at 30-70 deg.C to obtain boehmite as hydrolyzate, and heat-treating the boehmite at high temp. in the air to transform to the specified alumina.
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