. For high-stakes industrial or academic research, the curated accuracy of the ICDD PDF-4+ remains the industry standard, but for many students and independent researchers, open-access databases provide more than enough data to perform accurate phase identification. comparison table
If you are looking for crystallographic data without a budget for ICDD, several high-quality open-access databases serve as excellent substitutes: Crystallography Open Database (COD): icdd database free download
Focused on minerals, providing integrated XRD, Raman, and chemistry data for free. NIST Inorganic Crystal Structure Database (ICSD): providing integrated XRD
The International Centre for Diffraction Data (ICDD) maintains the Powder Diffraction File (PDF) icdd database free download
A specialized, free resource for minerals and related inorganic materials. RRUFF Project:
no legal, full version of the ICDD PDF database available for free download