Predicting Glass-to-Glass and Liquid-to-Liquid Phase Transitions in   Water
  Glass-to-glass and liquid-to-liquid phase transitions were observed many years ago in bulk and confined water with or without applied pressure. It is shown that they result from the competition of two-liquid phases separated by an enthalpy difference depending on temperature. The model is based on the classical nucleation equation of these phases completed by this enthalpy saving existing at all temperatures and a pressure contribution. The thermodynamic parameters of amorphous water, the multiple glass transition temperatures, the enthalpy changes, and the temperature of maximum density under negative pressure above Tg =227.5K are predicted to be in agreement with many measurements 
Robert F Tournier
cond-mat.dis-nn cond-mat.soft