Predicting temp. at which defects will set in


by sam_bell
Tags: defects, predicting, temp
sam_bell
sam_bell is offline
#1
Dec10-12, 03:01 PM
P: 67
Hi,

I am calculating surface energies for different kinds of defects in a bulk solid (e.g. twins, anti-phase boundaries, etc.) Let's say I get something like (just making this up) 1.0 meV/Angstrom^2. How would I calculate the temperature at which an appreciable number of said defect would be present in the sample? Classically, you have something like k_B T energy available per mode. But I get confused thinking about what might constitute a mode when talking about surface defects forming in a bulk crystal.

Thanks for suggestions,
Sam
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Useful nucleus
Useful nucleus is offline
#2
Dec10-12, 06:30 PM
Useful nucleus's Avatar
P: 240
I'm not aware of any statistical mechanical model that gives "equilibrium" number of "extended" defects (anything different than point defects) at a given temperature. Even the word "equilibrium" may not be appropriate here.


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