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Crystal growth 26-8 oxygen positions

The main part of a conventional Verneuil apparatus is a vertical inverted oxyhydrogen burner. The burner consists of several concentric tubes [1, 2]. The inner tube supplies oxygen and crystal powder to the flame, which burns into a ceramic muffle. A seed crystal is positioned in such a manner that only a thin film of liquid phase is on the top surface of the crystal. If the powder supply, i.e. the feeding of molten droplets into the molten layer, and the crystal growth rate are weU balanced, the crystal will grow under constant conditions. The principal design and operation of a Verneuil flame fusion apparatus was described earlier [3]. [Pg.331]

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Oxygen positive

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