温度・粘度
crystallization
Japanese: 結晶化
A phenomenon in which crystals grow within glass. As this process progresses, transparency, luster, and strength decrease (loss of transparency).
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Crystallization is the phenomenon in which amorphous (non-crystalline) glass transforms, through the application of heat, into a crystalline structure in which atoms and molecules are arranged in an orderly manner. In the context of glass fusing, this is often a problem known as devitrification, which causes cosmetic defects such as a white, cloudy surface or unevenness.
Crystallization is the second stage that follows nucleation. Crystals grow rapidly at a higher temperature than the nucleation zone (the crystal growth zone). To prevent devitrification, it is important to pass through this temperature range quickly, ensure that the surface is free of contaminants (grease and dirt promote crystallization), and minimize the number of firings.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.