The analysis of local structure requires novel experimental probes. Total scattering, a type of advanced scattering technique whereby Bragg and diffuse scattering are collected simultaneously. Analysis of the pair distribution function (PDF) produced from such data using Reverse Monte Carlo models can provide information on short-range order and local lattice distortions. We are working to help improve and develop novel methodologies for analysing such data and quantifying the results - unlocking new insight into the local phenomena. This work involves extensive collaboration with the UK National facilties: ISIS Neutron and Muon Source and Diamond Light Source.

Short-range order (sometimes called Chemical short-range order) is the tendancy for atoms to preferentially want to sit next to each other in a solid solution alloy. This local effect is known to cause changes in the materials properties including strength, electrical resistivity and radiation damage tolerance. Understanding this will give new insight into the nature of phase transitions and provide a new parameter for alloy design. Our studies approach this from a number of angles including: measurement of physical property changes, modelling and quantifying using local structural probe measurements.

Local lattice distortions occur when atoms are displaced away from their idealised atomic sites. This effect is known change the strength properties of alloys, due to the interaction of this local strain field with that of dislocations passing through the material - and is the basis for alloying. We are aiming to provide a better understanding of this phenomenom particularly in High Entropy Alloys (HEAs) where the 'Highly distorted lattice' is one of the four founding principles.

PDF analysis has already been demonstrated as being able to provide key insight into local structure phenomena in a host of interesting chemical systems. Using the methodologies we develop - we are seeking to understand local phenomena (such as chemical disorder and polyhedral tilting) in functional materials systems.

Diffraction methods are capable of capturing a number of different effects with materials. Study in the group is seeking to provide new methods into deformation mechanisms. This includes deformation from radiation damage, mechanical work and tooling, using a range of techniques including convolutional multiple whole profile fitting (CMWP), Laue scattering and grazing incidence.