| 摘要 |
PURPOSE:To obtain a single crystal of ruby having excellent transparency by using a starting material bar consisting of alumina as a main starting material incorporated with magnesium oxide, chromic oxide, and cobaltic oxide, and growing a single crystal by a floating zone method. CONSTITUTION:Alumina is used as a main starting material, and 0.1-0.2wt% magnesium oxide is used as an additive agent for removing bubbles, and 1- 2wt% chromic oxide as colorant, further, 1-5wt% cobaltic oxide is added for adjusting the color. Obtd. powdery mixture of the starting mterials is molded to form a starting material bar. An end of the starting material bar is melted, and the formed melted zone is moved and melting of the starting material and deposition of the solid phase are continued in accordance with the floating zone method, thus a single crystal is grown with <2mm./hr growing rate. By this process, entanglement of bubble is prevented, and a single crystal of ruby suitable as a gem having high transparency and luster, etc. is obtd.
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