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Methods used to grow β-quartz crystals include, gas and hydrothermal high-pressure vessels (10-12 ml internal volume) and autoclaves (20, 75 and 100 ml internal volume). The crystals were grown on bar-like α-quartz seeds at temperatures up to 900 o C and pressures from 20 to 500 MPa, under isothermal and thermal gradient conditions. Pure water and aqueous solutions of NaOH, K 2 CO...
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