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Surface energy

by aaaa202
Tags: energy, surface
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aaaa202
#1
Jan28-14, 09:48 AM
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Does atom at the surface of a crystal have more or less energy than those in the bulk? And how does this relate to their Gibbs free energy?
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Useful nucleus
#2
Jan29-14, 05:03 PM
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The notion of energy per atom in a solid is a bit ambiguous.
The surface atoms are under-coordinated (less number of bonds), thus it is expected that the average potential energy on the surface should be higher compared to the bulk.
I do not recall any general conclusion about the vibrational free energy of the surface or its stress-volume energy.
bcrowell
#3
Jan29-14, 09:46 PM
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At atom at the surface has a higher electrical PE than an atom in the bulk. This is because the electric force on the atom is inward.

aaaa202
#4
Feb2-14, 07:26 PM
P: 1,005
Surface energy

So is the surface energy simple the excess energy that the surface atoms have due to unsaturated Bonds?
Useful nucleus
#5
Feb7-14, 03:45 AM
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Quote Quote by aaaa202 View Post
So is the surface energy simple the excess energy that the surface atoms have due to unsaturated Bonds?
This is the "unrelaxed" surface energy.


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