Even in case of a "really random sample", the intensity of 00l peaks of
smectites is biased by a number of unknowns, like site occupation of
tetrahedral positions, interlayer cation and its hydratation stage, and
the usual instrumental and preparation effects at low angles like beam
overflow an
Thank you everyone. Yes, I am contemplating the rulette at this point :)
From: Lubomir Smrcok [mailto:[EMAIL PROTECTED]
Sent: Sat 3/15/2008 4:04 PM
To: rietveld_l@ill.fr
Subject: Re: Montmorillonite cif
Just few words of warning : think of preferred
Just few words of warning : think of preferred orienatation in your
samples... Moreover, from the vast majority of montmorilonites one gets
only few so
called "00L" diffractions what means that the results of quantitative
phase analysis can be better obtained by a random numbers generator :-)
> the cif-file below was created from the AMCSD...
> The I/Ic value calculated by Match! is 20.5
>>The only ICSD entry has an RIR of over 23, so does
>> vermiculite. Why is that so high?
I guess these differences in I/Ic are not very significant, since the
exact same montmorillonite entry is in I
###Comments
###
##
### Diffraction pattern calculated by Match!.
### I/Icor calculated by Match!.
###########
you can try the COD at:
http://www.crystallography.net/
daniel
> Hi,
>
> does anyone have a freely available structure file for montmorillonite
> (any hydration state)? Also, what is a reasonable Reference Intensity
> Ratio for it? The only ICSD entry has an RIR of over 23, so does
> vermiculit
Hi,
does anyone have a freely available structure file for montmorillonite (any
hydration state)? Also, what is a reasonable Reference Intensity Ratio for it?
The only ICSD entry has an RIR of over 23, so does vermiculite. Why is that so
high?
Thank you,
Maria Chrysochoou
