Hi! Be careful with LeBail. There is a paper (I can send it to you) showing, that this method may give some errors (so is probably also for Pawley method).
Best regards! Btw: preferred orientation should not influence the c parameter, but the intensity of an reflection. It can be influenced by sample displacement or (detector or XRD plane) zero shift, and of course due to impurities. Try Rietveld. Good luck! L. Kruszewski -- 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 > Dear rietvelders, > > I have carried out the single crystal resolution and the PXRD Le Bail > refinement of a Metal Organic Framework. > The compound crystalizes as needles and there is a clear in-plane > preferred orientation along the c-axis. > There is a mismatch between the single crystal and the Le Bail refinement > data in the lattice parameter c. > Could this mismatch be due to the preferred orientations? > > Regards, > Breogán Pato Doldán, > Fundamental Chemistry Department. > Faculty of Sciences. University of A Coruña > Rúa da Fraga 10, 15008, A Coruña. Spain. > Tel: +34 981167000 ext. 2061 > > > >
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