Entropy-based measure of structural order in water

Details Entropy-based measure of structural order in water Entropy-based measure of structural order in water

2006-03-28

arxiv.org/abs/cond-mat/0603764v2

Physical Review E 73, 040502(R) (2006)

Physics

Condensed Matter

Materials Science

5 pages, 2 figures, to appear in Phys. Rev. E (Rapid Communication)

Scientific paper

10.1103/PhysRevE.73.040502

We analyze the nature of the structural order established in liquid TIP4P water in the framework provided by the multi-particle correlation expansion of the statistical entropy. Different regimes are mapped onto the phase diagram of the model upon resolving the pair entropy into its translational and orientational components. These parameters are used to quantify the relative amounts of positional and angular order in a given thermodynamic state, thus allowing a structurally unbiased definition of low-density and high-density water. As a result, the structurally anomalous region within which both types of order are simultaneously disrupted by an increase of pressure at constant temperature is clearly identified through extensive molecular-dynamics simulations.

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