Abstract
Crystallization process of the BaO⋅TiO2 60, Al2O3 14, SiO2 26 mole% glass was examined in detail, for near its surface as well as in the interior. It was found that near the surface of the glass, a metastable benitoite-type crystal formed firstly and then transformed progressively to the stable barium titanate and hexacelsian whereas in the interior the barium titanate and hexacelsian formed from the first.
The cause of the preferred orientation of hexacelsian in the crystallized products was attributed to the preferred orientaion of the metastable benitoite-type crystal and the resemblance of the structure between the benitoite-type crystal and hexacelsian.
