i have obtained an additional peak in XRD at 31.7 degree. so i want to get the idea about this peak few articles mentioned it but not showing angle values.
Could you post an image from your diffractogram? I would not expect much help from JCPDS or PDF. There diffraction patterns are saved which are consistent with crystalline phases, i.e. all peaks match to a 3D translation lattice. If there is a single peak which suddenly appears, ir mostly indicate some experimental error like a "random" peak from the substrate. Possible is also a superlattice, but also this has to match to all other phases. A second phase is not that reliable since no phase has only one reflection. Therefore, it is the best way to send a picture in order to show, what do you "see". Possible, other people see "more" or "different things" :-)?
please find the attached JCPDS files of ZnSe.
Please note that elemental Cd and Se have a peak very close to 31.7.
If the other main peaks are overlapped by the main phase spectra, single peak can guide you in your analysis.
More interesting is reproduce the diffraction pattern from available free software as Power Cell a powerful and easy to use program; you only need the space group, lattice parameters and wyckoff positions.
Best regards
Pedro
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