I've been trying to obtain the cell parameters of CeVO4 and SmVO4 from rietveld refinement of XRD data. However the peaks seem to disappear after refining U, V, W parameters in Full-Prof software or any if the parameters in GSAS software. I completed the same with LaVO4 without any of the aforementioned issues. The cif file graph and obtained data are good matches. I was hoping someone would be able to help me with this.

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