I think that I just did a good job in my quantification: 50,2% calcite and
49,8% dolomite. Now I´m moving foward to a sinthetic mixture of calcite,
dolomite and kaolinite.
I have other questin, how can I determine a trustable value to the Full
Axial Model?! Especially the these paramters: samp
Leandro :
here is an example of calcite I used. You can use min and max to confine the
parameters.
One way to know whether it is right is to mix a known fraction of a compound,
e.g. ZnO with a ratio of original sample/ZnO=100/15.
At the end of the refinement, you have N components with N corr
Juske,
One point you should know the background in a TOF powder diffraction
pattern is not high - that is a nearly constant background multiplied by
a strongly varying incident spectrum which is much higher at short TOF
than at long TOF. Do a "divide by incident spectrum" and you wll see
what I mea
Hi, guys,
I´m having some trouble using the Bruker software TOPAS R, right now I´m
quantifying a sinthetic sample with 50% of calcite and 50% of dolomite.
Check the following questions an help me if you can.
1) I´m using the CIF files from ICSD, but when I put it in the software it
gives me
Dear all:
We're in the midst of Rietveld refinements of neutron TOF data acquired
at LANSCE NPDF. The NPDF gives very high backgrounds in low d- values
(TOF time), which drop quickly with d-value. After many iterations, the
fit between the data and model looks very reasonable, including the
b
Dear Tony,
diffraction intensity are sensible to volume fractions, not weight
percent. What you see in the Rietveld formulas are weight fractions
because they convert the scale parameter (in which there is the
volume fraction) into weight fractions using the density (the ZMV
factor contai
I think that if you have normalised wt% (or you're sure that all
phases are identified and you get a total of 100 wt%) then you can
divide each wt% by the phase density and renormalise.
If you have an unidentified phase then it is not really practicable
as you would have to estimate (or guess i
