I use profile type 2 in GSAS for refinement of oxide ceramic material. Grain size and microstrain may be calculated from the profile parameters LX, LY respectively. I want to know how much reliable the values are. After fixing Gaussian instrumental parameters, I refine the LX, LY parameters. What is the sequence of refinement of these parameters so that reliable and physicswise correct values may be obtained?
NB: I don't know grain size previously so that I may check the correctness of LX.
This is an obviously never-ending story.... Please first have a look at Researchgate. This topic has been discussed many times so that many of the really experienced guys do not answer anymore and you will very likely get some less reliable recommendations. From the discussion about the meaning of crystal size and strain you can make your own conclusion how good GSAS can finally be. I would in maximum trust the order... There are too many uncertainties which increase the unreliability of the final value which is calculated in a "ridicules" precision. Only if you know the assumptions and limitations of the applied models you can reduce these errors in order to consider as much as possible all requirements. A simple measurement will only give you a number.
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