Support UVa's Physics Department! >>
Click here for a printable version of this page.

Condensed Matter Seminars

ics Condensed Matter
Thursday, October 12, 2000
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Professor Ken Kelton [Host: Joseph Poon]
Department of Physics - Washington University
"Nucleation When Diffusion Becomes Important: A Tale of Two Fluxes"
The classical theory of nucleation does not properly describe nucleation processes when long-range diffusion becomes competitive with the interfacial processes. A new model is presented for time-dependent homogeneous nucleation in condensed phases, which takes account of the coupled fluxes of interfacial attachment and long-range diffusion. Numerical solutions from this new model show that the time-dependent nucleation rates scale with the dominant mobility and that the steady-state rates and induction times frequently differ significantly from values predicted by the classical theory. Surprisingly, the composition of the region of the parent phase near sub-critical crystal clusters is shifted toward that of the new phase. Consequences are discussed for solid state precipitation and the crystallization of Al-rare earth metallic glasses.

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Condensed Matter Seminars), date, name of the speaker, title of talk, and an abstract (if available).