Thermodynamic properties and structural features of water at normal and high pressures

The calculated and the experimental data on the structure and the thermodyn amic properties of water are analyzed in wide ranges of temperature and pre ssure. The conclusion is that water is a mixture of the low-density amorpho us (lda) and high-density amorphous (hda) ice clusters near normal conditio ns with their approximate proportion of 2:3. The conclusion is supported by the results of D2O quenching under a pressure of P = 1.2 GPa when the quen ched product was found to be a highly disordered crystalline phase with ice -XII as a prototype. (C) 2001 Elsevier Science B.V. All rights reserved.