DSC studies of melting behavior of heavy metal fluoride glass compositions

Differential scanning calorimetry (DSC) studies of a number of heavy fluoride glasses have been carried out while heating from below the glass transition up to 950K. The glasses first crystallize and then remelt. The final stage of melting is generally marked by a small, high temperature endotherm, whose location allows assignment of a liquidus temperature T L to the glass composition. The ratio T L T g of the liquidus to the glass transition temperature is roughly constant and equal to about 1.5 for a wide variety of glass compositions.