Abstract
A sol-gel procedure is developed to prepare successfully transparent, monolithic and crack-free borophosphosilicate bulk glasses. The reagents of Si(OC 2 H 5 ) 4 , H 3 BO 3 and H 3 PO 4 are used as the starting materials. The maximum total boron and phosphorus contents in borophosphosilicate glasses achieved here is 12 wt%. © 1989.