| 摘要 |
PURPOSE:To improve quality and to increase yield markedly in synthesis of an artificial beryl single crystal by installing a simple pulling device which is so arranged as to add beryl crystal into the fused salt of raw materials, and to pull up the single crystal by rotating the same. CONSTITUTION:A beryl crystal 2 is added into the raw material produced by adding the aluminum beryllate, silicon oxide and chromium oxide exhibiting approximately the compsn. ratios of natural beryllium and other coloring agents or a fused salt prepd. by using natural beryllium powder as a raw material and adding >=1 kind among molybdic acid, V2O5, tungstic acid, etc. and heating the same. Here the crystal 2 is fixed to a shaft 1 by means of a chuck or the like and is immersed in the fused salt of 750-1,200 deg.C with a heater 5. The shaft 1 is rotated at 1-200 rpm; at the same time, a crucible 3 is rotated at the same number of revolutions in the direction reverse from that of the shaft 1, and the crystal is pulled at 0.05-0.5mm. speed in a day. The improvement in quality and yield and the reduction in cost are resulted from the mere addition of the simple pulling device. |
