Glass formation and glass structure of BiO_1.5–CuO–Ca_0.5Sr_0.5O system

The glass-forming region of the BiO_1.5–CuO–Ca_0.5Sr_0.5O system has been determined by melting 5 g batches. Glass rods 4 mm in diameter and 75 mm long have been made. The glass transition temperatures (T_G) and the onset crystallization temperatures (T_x) are around 390 °C and 440 °C, respectively. Densities of these glasses range from 5.5 to 7.0 g/cm³. The glass structure consists of the [BiO₃] and [BiO₆] units, and the conversion between these two polyhedra mainly depends on the Ca_0.5Sr_0.5O amount. The molecular volume of the glasses indicated that increasing Ca_0.5Sr_0.5O caused loose glass structures.