Abstract
A variety of polycrystalline alumina and sapphire surfaces were successfully covered with ruby crystal layers by the isothermal evaporation of MoO3 flux. The grown ruby layers exhibited transparent-red, and the ruby-coated alumina materials showed beauty and luster in the as-grown state without skilled cutting and polishing. For sapphire substrates, the ruby layers were epitaxially grown on their surface. Furthermore, the growth model of ruby layers was discussed, and aluminum molybdate (Al2(MoO4)3) was found to be the intermediate compound for the growth of ruby crystals.
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