Abstract
Na 2O Al 2O 3 2.7 SiO 2 and BaO Al 2O 3 2 SiO 2 3(Na 2O Al 2O 3 2 SiO 2) type glass compositions with P 2O 5, TiO 2 and CaF 2 as additives were studied for nucleation and Crystallisation to obtain glass-ceramics. Structural OH groups seemed to be responsible for the initiation of crystallisation. Metastable sodium zeolite was the first phase to crystallise in the glasses. This subsequently transformed into cubic carnegieite on further heat treatment. In nephelene type composition glasses the crystalline assemblage in the glass-ceramics was nephelene and rutile. In nephelene plus celsian type composition glasses, nephelene, celsian and rutile were the major crystalline phases in the glass-ceramics.
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