Re: GSAS information (anisotropic microstrain)

[Brian H. Toby]

My advice on this question is that one should not use this approach. The 
Stephens formalism, coded in profile type 4, is better founded by 
theory. See the GSAS manual and reference to Peter Stephen's J. Appl. 
Cryst paper from a few years back.

Brian

Christophe Chabanier wrote:
Hello everybody,

i have a question about the GSAS software. Indeed, i would like to know 
what are exactly the L11, L22, L33....L23 parameters. I saw that these 
parameters represent the anisotropic microstrain in material. Moreover, 
there is an empirical expression which uses these parameters as following :

 Gamma(L) = L11*h^2 +  L22*k^2 + L33*l^2 + 2*L12*hk + 2*L13*hl + 2*L23*kl

 I would like to know and understand the physical representation of 
these parameters and this expression.

Thanks in advance

 

Christophe Chabanier
INRS-�nergie, Mat�riaux et T�l�communications
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