ISO 25498:2018 Preview

Microbeam analysis -- Analytical electron microscopy -- Selected area electron diffraction analysis using a transmission electron microscope

ISO 25498:2018 specifies the method of selected area electron diffraction (SAED) analysis using a transmission electron microscope (TEM) to analyse thin crystalline specimens. This document applies to test areas of micrometres and sub-micrometres in size. The minimum diameter of the selected area in a specimen which can be analysed by this method is restricted by the spherical aberration coefficient of the objective lens of the microscope and approaches several hundred nanometres for a modern TEM.

When the size of an analysed specimen area is smaller than that restriction, this document can also be used for the analysis procedure. But, because of the effect of spherical aberration, some of the diffraction information in the pattern can be generated from outside of the area defined by the selected area aperture. In such cases, the use of microdiffraction (nano-beam diffraction) or convergent beam electron diffraction, where available, might be preferred.

ISO 25498:2018 is applicable to the acquisition of SAED patterns from crystalline specimens, indexing the patterns and calibration of the diffraction constant.


General information

  • Status :  Published
    Publication date : 2018-03
  • Edition : 2
    Number of pages : 38
  • :
    ISO/TC 202/SC 3
    Analytical electron microscopy
  • 71.040.50
    Physicochemical methods of analysis

Buy this standard

Format Language
PDF + ePub
Paper
  • CHF158

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)

Keep up to date with ISO

Sign up to our newsletter for the latest news, views and product information

 Subscribe