Hello,
I am wondering why the RIR of clay minerals such as vermiculite and
montmorillonite is so high in the structural files (e.g. around 22-28). I am
not a crystallographer, but I have noticed that high RIRs are usually
associated with dense structures and heavy elements and neither is the case
with clays. And for example, kaolinite and illite have much lower RIRs, 1 and
0.5, even though the structures are not that much different. This results in
very very low concentrations when doing Rietveld, even though there is
substantial intensity associated with vermiculite and it does not make
intuitive sense to me.
I would appreciate any insight into this question.
Thank you,
Maria Chrysochoou
Associate Professor
Department of Civil and Environmental Engineering
University of Connecticut
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