> 8. The simple modified TCH model ("triple-Voigt"), used in most major > Rietveld programs these days, is surprisingly flexible. It works well > for most of the samples ("super-Lorentzian" is an example when it > fails, as well as many others, but this is less frequent that > onewould expect) and gives some "numbers" for coherent domain size > and strain. If we are lucky to know more about the sample (for > instance, the information is available that a lognormal size > distribution, certain type of dislocations, etc., is most likely to > be prevalent for majority of grains in > the sample), those "numbers" will let us calculate real numbers that > relate to the real physical parameters (say, the first moment and > dispersion of the size distribution, etc.) in many cases, as > discussed here previously.
Good conclusion, but before deriving real numbers that relate to the real physical parameters one needs first to calibrate the pseudo-Voigt-based calculation of those "numbers" (Dv and Da, or <L_volume> and <L_area> in other notations)using at least simulated profiles for VARIOUS dispersions. I hope that the round robin on simulated data will be translated into reality soon. Leonid __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com