Potential energy landscape of the apparent first-order phase transition between low-density and high-density amorphous ice

The potential energy landscape (PEL) formalism is a valuable approach within statistical mechanics to describe supercooled liquids and glasses. Here we use the PEL formalism and computer simulations to study the pressure-induced transformations between low-density amorphous ice (LDA) and high-densit...

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Veröffentlicht in:The Journal of chemical physics 2016-12, Vol.145 (22), p.224501-224501
Hauptverfasser: Giovambattista, Nicolas, Sciortino, Francesco, Starr, Francis W., Poole, Peter H.
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container_issue 22
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container_title The Journal of chemical physics
container_volume 145
creator Giovambattista, Nicolas
Sciortino, Francesco
Starr, Francis W.
Poole, Peter H.
description The potential energy landscape (PEL) formalism is a valuable approach within statistical mechanics to describe supercooled liquids and glasses. Here we use the PEL formalism and computer simulations to study the pressure-induced transformations between low-density amorphous ice (LDA) and high-density amorphous ice (HDA) at different temperatures. We employ the ST2 water model for which the LDA-HDA transformations are remarkably sharp, similar to what is observed in experiments, and reminiscent of a first-order phase transition. Our results are consistent with the view that LDA and HDA configurations are associated with two distinct regions (megabasins) of the PEL that are separated by a potential energy barrier. At higher temperature, we find that low-density liquid (LDL) configurations are located in the same megabasin as LDA, and that high-density liquid (HDL) configurations are located in the same megabasin as HDA. We show that the pressure-induced LDL-HDL and LDA-HDA transformations occur along paths that interconnect these two megabasins, but that the path followed by the liquid is different from the path followed by the amorphous solid. At higher pressure, we also study the liquid-to-ice-VII first-order phase transition, and find that the behavior of the PEL properties across this transition is qualitatively similar to the changes found during the LDA-HDA transformation. This similarity supports the interpretation that the LDA-HDA transformation is a first-order phase transition between out-of-equilibrium states. Finally, we compare the PEL properties explored during the LDA-HDA transformations in ST2 water with those reported previously for SPC/E water, for which the LDA-HDA transformations are rather smooth. This comparison illuminates the previous work showing that, at accessible computer times scales, a liquid-liquid phase transition occurs in the case of ST2 water, but not for SPC/E water.
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subjects Computer simulation
Configurations
Density
Fluid dynamics
Formalism
Ice
Liquid phases
Phase transitions
Physical simulation
Physics
Potential energy
Statistical mechanics
title Potential energy landscape of the apparent first-order phase transition between low-density and high-density amorphous ice
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