Abstract
Surface condition of silica glass reacting with silicon melt was investigated by in-situ observation, in order to clarify the effect of raw materials for silica crucibles used in CZ-Si crystal growth. It was found that the density of brownish rings in natural quartz glass was higher than that in synthetic silica glass. In addition, devitrification distinguished from brownish rings was observed as white spots at the interface in the case of natural quartz glass.
