Calorimetric Study Of Glasses And Liquids In The Polyamorphic System Y203-Al203

Liquids in the Y203-Al203 system exhibit liquid state "polyamorphism" with a transition occurring between two liquid phases (in the supercooled state) with the same chemical composition but different density and structure. Differential scanning and high temperature solution calorimetry experiments were performed on Y203-Al203 glasses quenched from polyamorphic liquids to establish the thermodynamic properties of the high a and low density amorphous phases and the energetic factors that drive the liquid-liquid phase transition.