PbO・V_2O_5 をフラックスとした高温溶液の冷却によるエメラルド結晶育成

概要

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The growth of emerald crystals by cooling in the PbO・V_2O_5 high-temperature solutions is reported. The crystal growth was conducted by heating mixtures at 1200℃ for 10h, followed by cooling to 600℃ at a rate of 5,10,20,40,120 or 240℃/h. The grown emerald crystals exhibited the typical emerald-green color, and were up to 2.2mm in size and transparent. Their form was a regular hexagonal rod bounded by the well-developed faces. The average size of grown emerald crystals was 1.1mm when the cooling rate was 5℃/h. The crystal sizes decreased as the cooling rate increased. Emerald crystals averaging 0.5mm in size were grown when the cooling rate was 240℃/h. The most suitable cooling rate for the growth of emerald crystals from PbO・V_2O_5 flux was 5℃/h. In addition, attempts to grow emerald crystals from the high-temperature solutions weighing 0.04-0.05g were successful. The small platinum crucible (5mmφ×2.5mm) was used. The mixtures were heated at 1200℃ for 10min, followed by cooling at a rate of 600℃/h. Hexagonal rod crystals of emerald up to 0.4mm in size were grown. The time taken to obtain emerald crystals was about ten hours.
宝石学会(日本)の論文
1993-12-31