Register to reply

Surface energy

by aaaa202
Tags: energy, surface
Share this thread:
aaaa202
#1
Jan28-14, 09:48 AM
P: 1,005
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?
Phys.Org News Partner Physics news on Phys.org
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors
Useful nucleus
#2
Jan29-14, 05:03 PM
Useful nucleus's Avatar
P: 249
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
Emeritus
Sci Advisor
PF Gold
bcrowell's Avatar
P: 5,578
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
Useful nucleus's Avatar
P: 249
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.


Register to reply

Related Discussions
Surface energy General Physics 2
Potential Energy Surface Biology, Chemistry & Other Homework 0
Surface energy.. Introductory Physics Homework 2
Surface Energy of a Balloon Introductory Physics Homework 2
Surface Energy... Atomic, Solid State, Comp. Physics 2