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At high temperatures, the quartz tube will undergo a chemical reaction with alkali metals, resulting in the formation of crystallization. These crystalline regions exhibit increased fragility, leading to the development of cracks. Potential sources of alkali metal contamination may include the following.

Crystallization mainly appears on the surface of quartz glass, followed by internal places with defects. This is because that these places are susceptible to contamination, which causes the partial concentration of impurity ions.