Electron backscatter diffraction

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Kikuchi pattern

Electron backscatter diffraction (EBSD) (after engl .: Electron Backscatter Diffraction ) is a crystallographic technique by which the structure of the crystals can be analyzed.

EBSD systems are mostly used in scanning electron microscopes or transmission electron microscopes . The way it works is that the incident primary electron beam scatters inelastically on the atoms of the sample , creating a divergent source in the sample. The sample is usually clamped at an angle of 70 °. If some electrons hit a grid surface in such a way that the Bragg condition is met, constructive interference occurs . This reinforcement now happens for all lattice surfaces in the crystal, so that the resulting diffraction pattern ( electron backscatter pattern, EBSP , also Kikuchi pattern ) contains all the angular relationships in the crystal and thus also the crystal symmetry. The resulting diffraction pattern is recorded with the help of a phosphor screen.

The use of the high local resolution of electron microscopes (~ 10–50 nm) and the automated image evaluation with the help of computers enables the spatially resolved determination (mapping) of the crystal symmetries ( crystal structure ) and their alignment ( crystal orientation ) as well as the analysis with appropriate software and high-resolution detection of material tension (strain analysis).

See also

Web links

literature

  • Joseph Goldstein et al .: Scanning Electron Microscopy and X-ray microanalysis 690 pages - Springer, New York. 2003 - 3rd edition - ISBN 978-0-306-47292-3
  • FJ Humphreys: Review Grain and subgrain characterization by electron backscatter diffraction , Journal of Materials Science, Volume 36, Number 16, pages 3833 to 3854, 2001

Individual evidence

  1. ^ A b Adam J. Schwartz, Mukul Kumar, Brent L. Adams, David P. Field: Electron Backscatter Diffraction in Materials Science . Springer Science & Business Media, 2013, ISBN 978-1-4757-3205-4 , pp. 17 ( limited preview in Google Book search).
  2. ↑ Electron Backscatter Diffraction EBSD. (pdf; 1.2 MB) (No longer available online.) Crystallographic Institute, Albert Ludwig University of Freiburg, archived from the original on March 6, 2006 ; Retrieved January 24, 2011 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.krist.uni-freiburg.de
  3. ^ Stephan Hasse: Structure of cast iron alloys . Fachverlag Schiele & Schoen, 2008, ISBN 978-3-7949-0755-7 , p. 38 ( limited preview in Google Book search).
  4. Jump up ↑ Joseph Goldstein, Dale E. Newbury, David C. Joy, Charles E. Lyman, Patrick Echlin, Eric Lifshin, Linda Sawyer, JR Michael: Scanning Electron Microscopy and X-ray Microanalysis Third Edition . Springer Science & Business Media, 2012, ISBN 978-1-4615-0215-9 , pp. 547 ( limited preview in Google Book search).
  5. ↑ Rozaliya Barabash, Gene Ice: Strain and displacement gradients from Diffraction Spatially-Resolved Local Structure and Defects . World Scientific, 2014, ISBN 978-1-908979-63-6 , pp. 411 ( limited preview in Google Book search).