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Friday, October 19, 2001
Physics Building, Room 204
Note special time.
[Host: Joe Poon]
Carnegie Mellon University
"Entropy in the Solid State"
Equilibrium states of matter balance the thermodynamic
tendency to minimize energy with the simultaneous need to maximize
their entropy. Depending on the temperature, different equilibrium
states may occur representing different tradeoffs between energy and
entropy, leading potentially to a multiplicity of solid state phases.
The phase diagram of a superalloy and of the element Pu illustrate the
importance of entropy residing in modes of atomic vibrations.
Additional examples will be given of quasicrystal- and glass-forming
alloys in which the entropy resides instead in novel discrete
configurational degrees of freedom.
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