u/Cassone123

Here just trying the fitting for dolomite

Hi everyone,

I’m fairly new to XRD and Rietveld refinement, and I’m currently trying to estimate the dolomite content in samples that also contain clays (mainly montmorillonite).

I keep running into the same issue: the dolomite phase starts fitting the broad low-angle peak that I believe belongs to montmorillonite, producing an obviously unrealistic fit in the low-2θ region. Even when the higher-angle dolomite reflections fit reasonably well, the refinement still tries to use dolomite intensity to account for that broad clay feature.

I'm using Profex as software, any advice or best practices would be greatly appreciated! Thanks!