>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/

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