Hi. I think XRF can help only in case of simple samples or, e.g., to disclude some "strange" elements, by proving there's none of them in the particular sample. But when you have, lets say, a mixture containing a spinel and periclase (MgO), then you won't be able to confirm by XRF itself that all the Mg determined is cointained in periclase only, as spinels take Mg too. An EDS or WDS system would be better here, but of course it gives reasonable results for thin sections mostly. However, even tiny 3D chunks of a sample can be used to confirm the presence of the particular species you've included in the QPA refinement.
Good luck! Luke Kruszewski > > Hello all, > > I use Rietveld primarily for quantitative phase analysis of rock samples. > We collect XRF and XRD data on our samples. > > Is there a best practice for using these data together? Or a recognized > method or procedure for evaluating the agreement between the two? Can the > XRF be used to restrain the phase concentrations in a refinement? > > Thank you all for the years of advice I have gotten from this forum. > > All the best, > Blaise > > -- Łukasz Kruszewski, Ph.D., adjunct Polish Academy of Sciences Institute of Geological Sciences X-Ray Diffraction Laboratory (coordinator) Twarda 51/55 str. 00-818 Warsaw Poland
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