Dear Mr. Werner,
this sounds for me like that there would be a problem in GSAS. If you
look to the formulas at page 155 of the GSAS manual, in all
trigonal/rhombohedral Laue groups there is no separate S004 for
rhombohedral settings (in fact S400 = S004). But for the hexagonal
settings (not
Dear all,
I have this question,
I have been refined one mixture (of well-know percentage composition) of
CaCO3, CaF2, SiO2 and Al2O3, with preferential orientation in CaCO3 (104)
and CaF2 (111) with good results. When I add to the mixture FeCO3 and I
refine with preferential orientation (104),
Dear Mario,
If the quantity of FeCO3 appears to be smaller than the actual value, then it
could be due to absorption. If you are using a copper source (CuKalpha) then
that excites iron fluorescence, which is radiated equally in all directions...
this means that the beam does not penetrate the
Dear Mario, My experience of quant Rietveld is much the same as yours - poor
quant result if using any sort of PO function. Advise as others have here -
reduce PO. Capillary geometry may help in many instances but in this case could
then have problems with absorption seeing as you will most
