I´m interested in to obtain raw data of x ray diffraction of different materials from open acces database for my students, in order to train it in retvield refinement using Match software or similar.
You can access the free databases of crystal structures, like Crystallography Open Database (COD), Cambridge Crystallographic Data Centre (CCDC) or American Mineralogist Crystal Structure Database (AMCSD), and download the CIF file of the compound you desire. Then, you can use softwares like VESTA or Diamond and calculate a powder pattern based on the structure described in the CIF file.