Experimental Evidence for a Crossover between Two Distinct Mechanisms of Amorphization in Ice Ih under Pressure

Thierry Strässle, Stefan Klotz, Gérard Hamel, Michael M. Koza, and Helmut Schober
Phys. Rev. Lett. 99, 175501 – Published 25 October 2007

Abstract

We report neutron scattering data which reveal the central role of phonon softening leading to a negative melting line, solid-state amorphization, and negative thermal expansion of ice. We find that pressure-induced amorphization is due to mechanical melting at low temperatures, while at higher temperatures amorphization is governed by thermal melting (violations of Born’s and Lindemann’s criteria, respectively). This confirms earlier conjectures of a crossover between two distinct amorphization mechanisms and provides a natural explanation for the strong annealing observed in high-density amorphous ice.

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  • Received 23 January 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.175501

©2007 American Physical Society

Authors & Affiliations

Thierry Strässle

  • Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

Stefan Klotz and Gérard Hamel

  • Physique des Milieux Denses, IMPMC, CNRS-UMR 7590, Université Pierre et Marie Curie, FR-75252 Paris, France

Michael M. Koza and Helmut Schober

  • Institut Laue-Langevin, FR-38042 Grenoble, France

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Issue

Vol. 99, Iss. 17 — 26 October 2007

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