Method of drawing single crystals

摘要

In a method of drawing single crystals from a body of highly pure polycrystalline material molten by inductive heating, a solid body of the polycrystalline material is first heated by direct induction heating at a frequency >200 KHz to increase its conductivity and is then further heated by direct induction heating at a frequency <20 KHz to melt the center of the body of polycrystalline material to form a molten pool contained by a marginal solid zone of the polycrystalline material from which the single crystal is drawn.