Tc Depression and H-O Bond Energy

The change in the phase transition temperature, 7c, is proportional to the bond energy E [1], which follows 

Consistency between MD-derived and measured proton symmetrization [10, 12], low compressibility [23], and phonon relaxation dynamics [4—6] of water ice verified the hypothesis that the weaker 0 H bond is highly compressive, yet the stronger H-O bond is elongated because of the resultant force of the compression, the repulsion, and the mechanical disparity within the H-bond. One may conclude 

Coulomb repulsion between the electron pairs and the mechanical disparity of the segments to compression form the key to the physical anomalies of ice upon compression. 

The resultant forces of compression. Coulomb repulsion, and the recovery of dislocation of the electron pairs in the respective segment of the H-bond dominate the P-derived proton symmettization, vibration, volume compression, and phase transitional anomalies of ice under compression. 

The initially longer and softer non-bond becomes shorter and stiffer, but the initially shorter and stronger real bond becomes the otherwise imder compression, which is in hne with the findings of energy contribution of different segments to the lattice energy [32]. 

---