NIST structural database used for phase identification in electron diffraction instruments. (News Briefs).Researchers use crystallographic crys·tal·log·ra·phy n. The science of crystal structure and phenomena. crys  tal·log information on a daily basis to visualize, explain, and predict the behavior of chemicals and materials. The NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. Structural Database (NSD NSDNairobi sheep disease. ) contains crystallographic and atomic positional information for metallic crystalline substances, including alloys, intermetallics, and minerals. Under an agreement recently signed with an instrument manufacturer, the NSD has been incorporated into an electron diffraction Electron diffraction The phenomenon associated with interference processes that occur when electrons are scattered by atoms to form diffraction patterns. instrument for automatic phase characterization and identification. The new electron diffraction software searches the NSD by elemental composition, retrieves the full structural crystallographic information, and uses this to generate a calculated or simulated electron diffraction pattern. Unknown phases can then be identified automatically by matching the calculated patterns with the observed patterns generated using the electron backscatter diffraction Electron backscatter diffraction (EBSD), also known as backscatter Kikuchi diffraction (BKD) is a microstructural-crystallographic technique used to elucidate the crystallographic texture or preferred orientation of any crystalline or polycrystalline materials. technique, an increasingly popular scanning electron microscope-based technique used for the analysis of samples in materials science, geology, microelectronics and related research fields. CONTACT: Vicky Lynn Karen, (301) 975-6255; vicky.karen@nist.gov. |
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