Brent Fultz - Non-Harmonic Phonon Thermodynamics

Tuesday 16 August 2011, 13:30

Brent Fultz , (California Institute of Technology)

The harmonic model usually gives a good starting point for understanding the vibrational thermodynamics of materials. At high temperatures, however, non-harmonic effects can alter substantially the thermodynamics of alloy phases. One effect can be understood as standard "quasiharmonic" behavior, where vibrational frequencies are lowered as a crystal expands against its bulk modulus. Most materials show a second effect from phonon-phonon interactions (PPI), and metals can show a third from electron-phonon interactions (EPI). We have been measuring these effects with inelastic neutron scattering, and calculating them with density functional theory.

Event type Seminar
Start date and time Tuesday 16 August 2011, 13:30
End Tuesday 16 August 2011, 14:30
Location CR16/17, R80
Maximum Audience 40
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