Figure 3. Glass-forming and approximate two-liquid regions in the SrO−TiO₂−SiO₂ system.

Closed and crossed symbols correspond to the examined compositions. Triangle: phase separated, circle: transparent glass and cross: devitrified. Star symbol shows the composition of PSC-GC, i.e. 35SrO−20TiO₂−45SiO₂. Open triangles in the TiO₂−SiO₂ and SrO−SiO₂ joins correspond to the points where a two-liquid phase is reported by DeVries et al. and Fields, Jr. et al., respectively. Dashed line across the diagram represents the lower limit of the glass-forming region in terms of SiO₂, which was reported by Imaoka and Yamazaki. We found a large glass-forming region that extends to the low-SiO₂ compositions.