>1)can we calculate dislocation density from X ray
>diffraction?
You mean by the Rietveld method ?
Well, some formula are the same for any kind of
dislocation. This should raise some doubt about
their validity.
So, I would briefly answer, concerning these formula :
No.
But contrary opinions are also circulating. No real
consensus.
See the book :
http://www.oup.co.uk/isbn/0-19-850189-7
and go to that future conference :
http://bragg.ing.unitn.it/sizestrain/
Best wishes,
Armel Le Bail
http://www.cristal.org/