Growth of Large Bipyramidal Ruby Crystals by the Evaporation of Molybdenum Trioxide Flux

  • TESHIMA Katsuya
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University
  • KONDO Hitoshi
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University
  • SUZUKI Takaomi
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University
  • OISHI Shuji
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University

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Other Title
  • 酸化モリブデンフラックス蒸発法による大型両錐ルビー結晶の育成
  • サンカ モリブデン フラックス ジョウハツホウ ニ ヨル オオガタ リョウ スイ ルビー ケッショウ ノ イクセイ

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Description

Large ruby crystals, exhibiting the typical transparent-red color, have been successfully synthesized by the evaporation of molybdenum trioxide flux. The grown crystals were up to 3.1×3.0 mm in size. In the case of 99 mass% of flux evaporation, the crystal sizes were dependent on the mixture (solute+flux) amounts. A sixfold increase in the mixture amount (30 to 180 g) resulted in double or higher increase in the average sizes (1.2×1.0 mm to 2.5×2.2 mm). The basic form of the grown crystals was a hexagonal bipyramid which consists of twelve well-developed {1123} faces. Furthermore, {0001} faces were also observed in large crystals, besides {1123} faces.<br>

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