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The International Centre for Diffraction Data (ICDD) maintains a database of powder diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. Patterns may be experimentally determined, or computed based on crystal structure and Bragg's law. It is most often used to identify substances based on x-ray diffraction data, and is designed for use with a diffractometer. The PDF contains more than a million unique material data sets. Each data set contains diffraction, crystallographic and bibliographic data, as well as experimental, instrument and sampling conditions, and select physical properties in a common standardized format.

The organization was founded in 1941 as the Joint Committee on Powder Diffraction Standards. In 1978, the current name was adopted to highlight the global commitment of this scientific endeavor.

The ICDD is a nonprofit scientific organization working in the field of X-ray analysis and materials characterization. It produces materials databases, characterization tools, and educational materials, as well as organizing and supporting global workshops, clinics and conferences.

Products and services of the ICDD include the paid subscription based Powder Diffraction File databases (PDF-2, PDF-4+, PDF-4+/Web , PDF-4/Minerals, PDF-4/Organics, PDF-4/Axiom, and ICDD Server Edition), educational workshops, clinics, and symposia. It is a sponsor of the Denver X-ray Conference and the Pharmaceutical Powder X-ray Diffraction Symposium. It also publishes the journals Advances in X-ray Analysis and Powder Diffraction.

In 2019, Materials Data, also known as MDI, merged with ICDD. Materials Data creates JADE software used to collect, analyze, and simulate XRD data and solve issues in an array of materials science projects.

In 2020, the ICDD and the Cambridge Crystallographic Data Centre, which curates and maintains the Cambridge Structural Database, announced a data partnership.

See also

• Powder diffraction
• Crystallography

References

External links

• International Centre for Diffraction Data official website
• History, contents & use of the PDF
• Materials Data
• Advances in X-ray Analysis—Technical articles on x-ray methods and analyses
• Powder Diffraction Journal—quarterly journal published by the JCPDS-International Centre for Diffraction Data through the Cambridge University Press
• Denver X-ray Conference—World's largest X-ray conference on the latest advancements in XRD and XRF
• PPXRD-16 —Pharmaceutical Powder X-ray Diffraction Symposium

v t e Crystallography
Key concepts	Timeline of crystallography Crystallographers Metallurgy Biocrystallography Structure Unit cell Bravais lattice Miller index Point group Reciprocal lattice Restriction theorem Periodic table Structure prediction Systems Cubic Hexagonal Monoclinic Orthorhombic Tetragonal Triclinic Growth Crystallite Equiaxed Twinning Fiveling Aperiodic crystal Quasicrystal Phase transition Phase diagram Eutectic Miscibility gap Polymorphism Liquid crystal Phase transformation crystallography Precipitation Segregation Spinodal decomposition Supersaturation GP-zone Ostwald ripening Defects Grain boundary Disclination CSL Growth Abnormal growth Perfect crystal Stacking fault Dislocation Burgers vector Partial dislocation Kink Cross slip Frank–Read source Cottrell atmosphere Peierls stress GND Lomer–Cottrell junction Slip Slip bands Interstitials Bjerrum defect Frenkel defect Wigner effect Vacancy Schottky defect F-center Stone–Wales defect Defects in diamond Bragg's law Bragg plane Ewald's sphere Friedel's law Hermann–Mauguin notation Structure factor Thermal ellipsoid
Characterisation	Electron Diffraction Scattering Neutron Diffraction Scattering Nuclear magnetic resonance X-ray Diffraction Scattering
Algorithms	Direct methods Isomorphous replacement Molecular replacement Molecular dynamics Patterson map Phase retrieval Gerchberg–Saxton Single particle analysis
Software	CCP4 Coot CrystalExplorer DSR JANA2020 MTEX OctaDist Olex2 SHELX
Databases	Bilbao Crystallographic Server CCDC CIF COD ICSD ICDD PDB
Journals	Crystal Growth & Design Crystallography Reviews Journal of Chemical Crystallography Journal of Crystal Growth Kristallografija Zeitschrift für Kristallographie – Crystalline Materials Zeitschrift für Kristallographie – New Crystal Structures
Awards	Carl Hermann Medal Ewald Prize Gregori Aminoff Prize
Organisation	IUCr IOBCr RAS DMG Associations Europe France Germany UK US Japan
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