| 摘要 |
PURPOSE:To obtain corundum having high quality contg. no bubble by mixing an inorg. acid salt of aluminium, iron, chromium, etc. in a proportion of compsn. of orange saphire, decomposing by heating, molding, and sintering the mixture, and synthesizing thereafter a crystal by the light collecting floating method. CONSTITUTION:(A) Ammonium carbonate, hydroxide, ammonium sulfate, or sulfate, of aluminium, (B) ammonium sulfate, hydroxide, or chloride, of iron, and (C) hydroxide, nitrate, sulfate, or chloride, of chromium, are mixed in a proportion so as to coincide with the compsn. of orange sapphire. Then, starting material powder is prepd. by decomposing the mixture by heating, which is molded to a circular columnar bar and sintered in an electric oven. Using the obtd. starting material bar as a starting material, and using a single crystal of corundum as seed crystal, a crystal is synthesized by the light collecting floating method. Thus, a corundum consisting of orange sapphire being suitable as a gem member is obtd.
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