Devitrification inhibitors in borosilicate glass and binary borosilicate glass composite

Cristobalite is known to precipitate out of borosilicate glass (Corning 7740) and a binary glass mixture of borosilicate glass and high silica glass when these glasses are heated to elevated temperatures. To prevent cristobalite from forming in these glass systems, a devitrification inhibitor needs to be found. Among oxides selected for testing, both Al₂O₃ and Ga₂O₃ are found to prevent cristobalite from forming in these glass systems.