The dynamic nature of high pressure ice VII

TL;DR

This paper introduces a dynamic entropy-based theory to analyze phase transitions in high pressure ice VII, emphasizing the role of a dynamic field over traditional thermodynamic variables.

Contribution

It presents a novel dynamic entropy framework to distinguish between static and dynamic states of ice VII, focusing on proton transfer patterns.

Findings

Discriminates ice VII and dynamic ice VII states via dynamic entropy curves.

Identifies proton transfer patterns as microscopic differences.

Proposes a general dynamic theory applicable to condensed matter systems.

Abstract

Starting from Shannon's definition of dynamic entropy, we proposed a simple theory to describe the transition between different rare event related dynamic states in condensed matters, and used it to investigate high pressure ice VII. Instead of the thermodynamic intensive quantities such as the temperature and pressure, a dynamic intensive quantity named dynamic field is taken as the controlling variable for the transition. Based on the dynamic entropy versus dynamic field curve, two dynamic states corresponding to ice VII and dynamic ice VII were discriminated rigorously in a pure dynamic view. Their microscopic differences were assigned to the dynamic patterns of proton transfer. This study puts a similar dynamical theory used in earlier studies of glass models on a simple and more fundamental basis, which could be applied to describe the dynamic states of realistic and more condensed matter systems.