Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 109, Issue 12, Pages 5421-5424Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp050690z
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We use classical molecular dynamics combined with the recently developed metadynamics method [Laio, A.; Parrinello, M. Proc. Natl. Acad. Sci. U.S.A. 2002, 99, 20] to study the process of bulk melting in hexagonal ice. Our simulations show that bulk melting is mediated by the formation of topological defects which preserve the coordination of the tetrahedral network. Such defects cluster to form a defective region involving about 50 molecules with a surprisingly long lifetime. The subsequent formation of coordination defects triggers the transition to the liquid state.
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