The International Centre for Diffraction Data (ICDD) PDF-4+ database is the industry standard for X-ray powder diffraction reference data. Because it is a high-value scientific resource, it is not typically available as a direct, free download for the general public.
: Download a .cif file → use free software like VESTA , Mercury , or GSAS-II to simulate the powder pattern. Icdd Pdf-4 Database Free Download
If your budget is $0, you don't have to give up. Several and tools can perform similar phase identification tasks. 1. Crystallography Open Database (COD) The International Centre for Diffraction Data (ICDD) PDF-4+