Hello,

I have been using the GSAS software to analyse some XRD data from MgH2
samples that have been heavily milled.  
One piece of information I would like to assertain is the mean particle
size of my powders.  The powders are of the order of 10 nm by TEM.  
Some relevant information;
I am using a type 2 profile function.
My data is horrible with very broad peaks of very low intensity.  
I have had to set the GU GV and GW parameters in order to do anything at
all. If I let them float then I lose any semblance.  
I get a Chi2 < 1.
My question is this;
        How do I obtyain the particle size?  

Is it the LX parameter and is this measured in Angstroms?

I hope someone will be kind enough to help me out of this mire!

Regards

Dave Weston 
Research Fellow
Department of M3 
Wolfson Building
University of Nottingham

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