Synthesis, structure, and properties of glasses under extreme conditions

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Authors
Guerette, Michael
Issue Date
2014-12
Type
Electronic thesis
Thesis
Language
ENG
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Materials science and engineering
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Abstract
Pressure-quenching from the non-rigid state near the glass transition temperature imparts structural signatures to densified silica glass that cannot be accomplished through cold compression at room temperature. The unique structures of pressure-quenched silica glass are reflected in decreased anomalous response of silica glass to external stimuli of high temperature or high pressure, and therefore greater thermo-mechanical stability. The nonlinear elastic behavior of silica glass has been directly probed from the compressive to the tensile side of silica fibers in bend by using in-situ Brillouin light scattering. This provides a convenient way to determine the neutral axis shift, which in turn allows more accurate stress calculations in bent fibers. The corresponding structure changes in compressive and tensile regions relative to the neutral axis were studied by Raman spectroscopy. A fundamental understanding of the structure and elastic properties of silica glass under extreme conditions was gained, which is of critical importance for developing strong and stable silicate glasses.
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December 2014
School of Engineering
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Rensselaer Polytechnic Institute, Troy, NY
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