Study of relationship between suppression of devitrification of silica glass and crystal phase change

Abstract

Characteristics of the devitrification of silica glass containing 1000 wt. ppm of Cl by contact with a NaCl crystal grain were investigated. The characteristics were compared with various types of silica glasses containing Cl-free and various amounts of OH. We exhibited that Cl-contained silica glass has potential of suppression of devitrification. In XRD data, growth of tridymite in Cl contained silica glass was significantly smaller than Cl-free samples. The fact that the devitrification is suppressed in Cl-contained sample suggests that the growth of tridymite might be suppressed by chlorine in silica glass.