大型合成ダイヤモンドに含まれる不純物についての最近の研究
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概要
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The largest diamonds are 15mm across in the world. They are large onough to be distributed in a gem market, and it is interesting how they are distinguished from natural crystals. Color is a factor to characterize the crystals, and this paper reviews studies on atomic impurities, which influence optical properties, in synthetic diamonds. Nitrogen content can be controlled by choosing composition of metal catalysts, and a colorless crystal is obtained using a metal catalyst containing nitrogen getters such as titanium. Growth temperature and annealing temperature are also parameters which control concentration and structure of nitrogen. Boron is easily incorporated in grown crystals, producing blue color, if it is present in the growth cell. Depth of blue color depends on metal catalysts and boron content in the cell. Nickel is also incorporated in diamonds, and induces green or brown color. These impurities are inhomogeneously distributed in the crystals.
- 宝石学会(日本)の論文
- 1992-12-15