Combinatorial approach to new glasses

An 18-sample glass-melting furnace was newly developed and glass-forming compositional regions were found in lead-free B2O3–TeO2–[xBaF2/(100 x)BaO] ternary systems. The softening temperatures were measured in the systems to screen out lowmelting compositions. The softening temperature ranges from 450 to 470 8C and the thermal expansion coefficient ranges (115– 140) 10 7 8C 1. These values were comparable to those of typical lead-containing glasses. It was also found that substitution of BaF2 for BaO effectively lowers the melting temperatures without changing the thermal expansion coefficient