Skip to main navigationSkip to main content
The University of Southampton
EngineeringOur research

Chemical Analysis

EDS spectra of WSC coating
EDS spectra of a WSC coating

Chemical analysis of can be performed by both the Scanning Electron and Transmission Electron Microscopes (SEM and TEM) using a technique called Energy-dispersive X-ray spectroscopy (EDS, EDX).  This technique employs a source of high-energy beam of charged particles such as electrons to excite the sample.  This excites the outer electrons in the molecules at the surface of the sample.  Upon relaxation, X-rays are produced that can characterise the elements in the excite region.  This can be performed as a spot or area analysis to determine local or more global compositions, as shown by the graphical plot for WSC coating. 

EDS elemental map for W
Elemental composition map

Additionally elemental maps can be produced, here an area is scanned for specific elements.  The map appear as collection of speckles, the higher the density the large the concentration of the element.  The map shown is a wear track on a WSC coating where the wear track has a lower concentration of tungsten (W) that the unworn coating.

nCATS Facility – coating assessment equipment includes:


Return to main nCATS facility page
Privacy Settings