About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
In Situ Inelastic Neutron Scattering Measurements of Glassy Liquids |
Author(s) |
Hillary Smith, Marios Demetriou, Brent Fultz |
On-Site Speaker (Planned) |
Hillary Smith |
Abstract Scope |
Glasses transform from a stable glass to an undercooled liquid at the glass transition temperature far below their melting temperature. We have used in situ inelastic neutron scattering (INS) to measure the phonon density of states in a variety of glasses during continuous heating from the glass phase to an undercooled liquid, then into the crystalline phase. Time-resolved INS measurements are performed with event-mode data collection to assess the phonon entropy from the vibrational density of states in as little two minutes. The dynamics of the glass in its metastable liquid state are compared to its stable crystalline phase across the same temperature range to determine the excess vibrational entropy. We report measurements for a variety of glass types including metallic glasses, oxide glasses, molecular glasses, and chalcogenide glasses. Results will be considered in the context of a universal understanding of vibrational contributions to the thermodynamics of the glass transition. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Characterization, Ceramics |