Growth of Emerald Crystals by the Flux Evaporation Method in MoO<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> System

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  • OISHI Shuji
    Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University
  • MOCHIZUKI Keisuke
    Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University
  • HIRANO Shin-ichi
    Department of Applied Chemistry, School of Engineering, Nagoya University

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  • MoO<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>フラックス蒸発法によるエメラルド結晶の育成
  • MoO3 B2O3 フラックス ジョウハツホウ ニ ヨル エメラルド ケッショ

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Abstract

The growth of emerald crystals by the flux evaporation method in the system MoO3-B2O3 is reported. The crystal growth was conducted by heating a mixture of a solute (3BeO⋅Al2O3⋅6SiO2+1wt% Cr2O3) and a flux (MoO3-B2O3) at 1100°C, followed by holding at 1100°C for 10, 20, 25 and 30h. The evaporation loss of flux decreased gradually with increasing amount of B2O3 added to MoO3 and increased with the holding time. The transparent emerald crystals were grown with the typical emerald-green color in size up to 1mm. The crystal size was dependent on the evaporation loss of flux. Hexagonal thin plate-like crystals were grown from an MoO3-rich flux containing 0.15-0.60wt% B2O3. The plate-like crystals were bounded by the {0001} and {1010} faces. In rare cases, the small {1120} faces appeared. Crystals grown from the MoO3 flux were twelve-sided prism in shape. Molybdenum trioxide containing a small amount of B2O3 was found to be a suitable flux for growing plate-like crystals of emerald.

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