Session L27: Glassy Systems
2:30 PM–5:06 PM, Tuesday, March 6, 2007
Colorado Convention Center Room: 301
Sponsoring Unit:
DCMP
Chair: Dimitrios Papaconstantopoulos, George Mason University
Abstract ID: BAPS.2007.MAR.L27.4
Abstract: L27.00004 : Tunable structures and properties in vitreous silica
3:06 PM–3:18 PM
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Abstract 
Authors:
Liping Huang
(North Carolina State University)
John Kieffer
(University of Michigan)
We studied the structures and properties of vitreous silica samples prepared by specific high pressure processing routes, using molecular dynamics simulations based on a charge-transfer three-body potential. Our study shows that the ability of the glass to undergo irreversible densification is inherently connected to its anomalous thermo-mechanical properties, such as the minimum in the bulk modulus at $\sim $2-3 GPa and the negative thermal expansion while under pressure. These behaviors can be tuned by controlling the pressure under which the initial glass was quenched. By preparing silica glass in ways that eliminates anomalous thermo-mechanical behaviors, e.g., by quenching a melt under pressure, the propensity of the glass to undergo irreversible densification can be eradicated. Such ``pressure-treated'' silica glass is less susceptible to radiation damage and can potentially increase the lifetime of many optical components.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.L27.4