|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Hume-Rothery Award Symposium: Thermodynamics of Materials
||Vibrational Entropies of Liquids and Glasses
||Hillary Smith, Marios Demetriou, Brent Fultz
|On-Site Speaker (Planned)
Inelastic scattering methods were used to measure the vibrational entropy across the glass transition for metallic glasses Cu50Zr50 and Cu46Zr46Al8, and the molecular glass GeO2. Phonon spectra were measured during continuous heating and cooling, and post-binned to determine the vibrational entropy in the glassy, supercooled liquid, and crystalline states. These three glasses differ fundamentally in their structure, bonding, and glass-forming ability. For the most fragile of these glasses, Cu50Zr50, the excess entropy of the glass transition was found to be less than 5% vibrational. Metallic glasses are characterized by topological disorder, while the configurational disorder in oxide glasses is predominantly orientational. The excess vibrational entropy of the supercooled liquid over the crystalline phase will be compared for all three glass-formers.
||Planned: A print-only volume