Electron Diffraction
(PDF-4+ 2015, PDF-4/Minerals 2015, PDF-4/Organics 2016)

Often in materials characterization, diverse forms of diffraction are used to complement one another. Research scientists often use electron diffraction as a method for obtaining diffraction intensities from nano-scale quantities of a material when X-ray scattering is limited. Given the complimentary character of the two techniques, ICDD has developed various options and tools that enable users to specify a diffraction type (X-ray or electron) when using the PDF-4+ reference database and its search/match capabilities.

The suite of electron diffraction tools currently includes:

  • Interactive simulation modules
    - Electron diffraction (ED) spot patterns
    - 2-D powder patterns
    - Electron back-scattered diffraction patterns
  • Graphical overlays (data imports)
electron diffraction

Users' experimental spot pattern (white spots) and graphical overlay of ED simulation of phase match from PDF-4+ (red spots). (Each simulation is interactive allowing dynamic updates to patterns by simply adjusting parameters such as zone axes, camera length, and electron voltage.)

New Capabilities: Auto-indexing of zone axis in electron diffraction spot patterns

In 2014, ICDD implemented an ability to identify the zone axis in a users' electron spot pattern. This new tool extracts spot positions (hkl's) from the users' ED spot pattern, and performs automated indexing to determine the zone axis. New in Release 2015: The d-spacings and intensities of identified spots can now be listed in table format after the scale is specified. The table can then be saved as a ASCII format file. The user may also import data and generate graphical overlays for comparisons between possible phase matches.


Fast Facts on ICDD's Electron Diffraction Capability

  • Spot indexing
  • ED simulations for 305,013 entries
  • ED based phase ID
  • Atomic & molecular visualization

For more details, check out ICDD’s…

Technical Bulletin(s):

electron diffraction technical bulletin

Publications & Presentations:

Tools for Electron Diffraction Pattern Simulation for the Powder Diffraction File – J. Reid, D. Crane, J. Blanton, C. Crowder, S. Kabekkodu, and T. Fawcett

M&M 2015: "Electron Diffraction Phase Analysis and Pattern Simulations Using the ICDD Powder Diffraction File (PDF-4+)" (poster) – S. Gates, K. Zhong, T. Blanton, J. Blanton