A Source Of The Immiscibility Controversy Of Borate And Borosilicate Glass Systems

Because phase separation affects glass properties such as chemical durability, it is important to clarify this phenomenon, especially the immiscibility boundaries. Despite extensive investigation, controversy persist in regard to the immiscibility boundary of borate and borosilicate systems. The controversy has been suggested to originate from a change in glass structure with heat-treatment temperature or fictive temperature, which, in turn, causes a change in the immiscibility tendency.