Melting and Pressure-Induced Amorphization of Quartz

Abstract

It has recently been shown that amorphization and melting of ice were intimately linked. In this letter, we infer from molecular dynamics simulations on the SiO2 system that the extension of the quartz melting line in the metastable pressure-temperature domain is the pressure-induced amorphization line. It seems therefore likely that melting is the physical phenomenon responsible for pressure induced amorphization. Moreover, we show that the structure of a "pressure glass" is similar to that of a very rapidly (1e+13 to 1e+14 kelvins per second) quenched thermal glass.

9 pages, 4 figures, LaTeX2e

References in corpus (2)

• Cooling rate effects in amorphous Silica: A Computer Simulation Study
• Numerical simulation of alpha-quartz under non-hydrostatic compression. Memory glass and five-coordinated crystalline phases

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• Temperature-Dependent Defect Dynamics in the Network Glass SiO2
• Pressure-induced amorphization, crystal-crystal transformations and the memory glass effect in interacting particles in two dimensions
• Universal Scaling in the Aging of the Strong Glass Former SiO${}_2$