Schott Ag

Thomas Kaufhold

Lutz Parthier

Gunther Wehrhan

Clemens Kunisch

Joerg Kandler

The method for producing single crystals includes drying crystal raw material by removing water, reaction of impurities with a scavenger, preferably a metal halide, and homogenizing the melt. The method is performed with the raw material in a melt vessel with a variable-sized through-going opening, in which drying occurs at 100&#xb0; C. to 600&#xb0; C. for at least 20 hours with a geometric conductance value for the through-going opening of 2.00 to 30.00 mm; the reacting occurs at 600&#xb0; C. to 1200&#xb0; C. for at least nine hours with a geometric conductance value of 0.0020 to 0.300 mmand the homogenizing occurs at above 1400&#xb0; C. for at least six hours with a geometric conductance value of 0.25 to 1.1 mm. Alternatively the geometric conductance value is the same during drying, reacting and homogenizing and takes a value between 0.25 and 1 mm.

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Buergel, Germany

Thomas Kaufhold