QUALITY-EVALUATED VITREOUS SILICA CRUCIBLE
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United States of America Patent
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app pub date -
Apr 14, 2017
filing date -
Jun 30, 2013
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Abstract
A quality-evaluated vitreous silica crucible for pulling silicon single crystal is provided, wherein an inner surface of the vitreous silica crucible has regions where surface defects including brown rings are to be generated when pulling silicon single crystal. The regions are distinguished using an infrared absorption spectrum or a Raman shift of the regions, wherein a position of each region and/or a density of the regions are/is specified.
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