If the cost of a PDF-4 license is prohibitive, several open-source databases provide similar crystallographic data for X-ray diffraction (XRD) phase identification:
: The SIeve+ search-indexing software , which is used to identify unknown materials using the database, is available for a 30-day free trial . Icdd Pdf-4 Database Free Download
: A comprehensive free resource for mineral data. Match! using free-of-charge reference data - Crystal Impact If the cost of a PDF-4 license is