The International Centre for Diffraction Data (ICDD) maintains the Powder Diffraction File (PDF). The
Pirated databases often have missing entries, broken search keys, or corrupted experimental patterns, which will ruin your research analysis.
| Database Name | Primary Focus | Key Features | | :--- | :--- | :--- | | | Comprehensive inorganic and organic materials | The world's largest crystallography database (over 1.12 million entries). Includes diffraction data, crystal structure data, atomic coordinates, and supports advanced quantitative analysis. | | PDF-4/Minerals | Mineralogy and mining | The world's most complete mineral database, covering 97% of all known mineral types (approximately 54,900 entries). A subset of PDF-5+ with all its advanced features. | | PDF-4/Axiom | Routine analysis for benchtop users | A cost-effective option with 114,000+ selected entries, ideal for routine phase identification and quantification. | | PDF-2 | General-purpose identification | A smaller database (approximately 369,000 entries) containing only standard diffraction data for phase identification, without the advanced structural and quantitative analysis data. | | PDF-4/Organics | Pharmaceutical, chemical, and forensic fields | The world's largest X-ray powder diffraction database specifically for organic materials. | Icdd Pdf-4 Database Free Download
It features built-in search-match software and deep integration with major XRD instrument manufacturers.
typically leads to unauthorized or fraudulent sites. The PDF-4+ is a highly specialized, proprietary commercial database used for X-ray diffraction (XRD) analysis, and no legitimate free version available for download 1. What is the ICDD PDF-4+ Database? | | PDF-4/Axiom | Routine analysis for benchtop
Go to www.icdd.com – the official website. Look for "Products" → "PDF-4+."
Multi-year registration packages lower the annual cost of PDF-4 data updates. To help find the right setup for your research, tell me: you will download adware
The COD is the most popular open-access alternative to the ICDD database. It contains over 500,000 entries of organic, inorganic, and organometallic crystal structures. 100% Free Format: CIF (Crystallographic Information File)
While the full version is paid, they offer limited free web-based demo versions or heavily discounted regional consortium access for students. Free XRD Analysis Software to Pair with Open Databases
Many "free download" websites generate revenue through fake download buttons. Instead of the PDF-4 database, you will download adware, browser hijackers, or "driver updater" scams.