Electron Microscope and X-ray Unit (EMX)
Central Scientific Services
Tungsten bronze research
- I use powder X-ray diffraction (XRD) extensively as a tool to investigate the chemistry and composition of my samples in my PhD project. I’m researching the optical properties of NaxWO3, where x can be anything between 0 and 1. All of the products of the synthesis technique are crystalline, and so XRD, combined with Rietveld refinement, can be used to quantify the chemical composition of my samples. Furthermore, different crystal structures and lattice parameters are observed for different ranges of x, and so XRD is an essential tool to determine the x of an unknown sample.
- Grazing-incidence XRD (GI-XRD) allows me to inspect the nanoscale properties of my samples in ways that conventional powder XRD cannot. In my project, I’m attempting to synthesis NaxWO3 nanoparticles, but some samples have been observed to form an oxide layer on the outside of the particles. GI-XRD allows me to identify crystalline phases that may only exist in ≈ 10 nanometre thick layers, which would otherwise be difficult to detect in regular XRD or TEM.
Mr Levi Tegg
Ph.D candidate in Physics
School of Mathematical and Physical Sciences
Faculty of Science
The University of Newcastle