>Dear Nicolae,
>Maybe ya ploho chitayu i ploho soobrazhayu, but even after your >explanation I can't see a way to calculate <R> from the results of >fitting described in chapters 6 & 7 of JAC 35 (2002) 338-346. From such >fitting you obtain only dispersion parameter c. Or I missed something? >Anyway, being "Rietvelders" we still have to deal with TCH-pV function >and we need to extract as much as possible correct information from it. >Hope we shall see more appropriate functions for microstructure >analysis in popular Rietveld programs. >Cheers, >Leonid Dear Leonid,
Indeed you missed something. I presume you
have the paper. Then, take a look to the formula (15a). This is the size profile
for lognormal. There is the function PHI - bar of argument
2*pi*s*<R>. Replace this function PHI - bar from (15a) by the
_expression_ (21a) with the argument x=2*pi*s*<R>. You get it? So,
not only "c" but also <R>.
"We are Rietvelders" means that we must be
only "codes drivers", "cheffeurs des codes", "voditeli program"? Have we to
accept the "Procust bed" of the Rietveld codes at a given moment? All Rietveld
codes are improving in time, isn't it?
In particular for the Round_Robin sample
TCH-pV works because c=0.18. (Davor explained how Dv and Da are found). But if
c>0.4 any pV fails.
Best wishes,
Nicolae
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