We use cookies on this site. By browsing our site you agree to our use of cookies. Close this message Find out more

Home > Earth Sciences home > Laboratories > X-ray Diffraction
More in this section Laboratories

X-ray Diffraction

 

There are several methods that can be used to identify a material, but one of the most common is that of X-ray diffraction (XRD). In this method, a small amount of the powdered material is placed on a glass slide, and exposed to a beam of X-rays. The resulting reflections and reinforcements of the X-rays at characteristic angles are then used to identify the unknown substance.

This method is especially useful for the characterisation of clay minerals, as various treatments (glycol, heat) change the XRD pattern and these changes can provide further information on the nature of the clay phase.

We use a Philips PW1830/3020 spectrometer and copper Kα X-rays. Mineral peaks can be identified manually or automatically from the ICDD Powder Diffraction File (PDF) database.

Quantitative analysis of mixtures to determine the exact proportions of different phases can be carried out using Rietveld analysis.

xrd1

Typical XRD output showing peak identification markers


xrd2

Rietveld analysis showing peak fit and residuals

 

 

xrd3
 
 
 
 

Comment on this page

Did you find the information you were looking for? Is there a broken link or content that needs updating? Let us know so we can improve the page.

Note: If you need further information or have a question that cannot be satisfied by this page, please call our switchboard on +44 (0)1784 434455.

This window will close when you submit your comment.

Add Your Feedback
Close