A5060939051- Nuclear Materials and Properties
- Perovskite Materials and Applications
- Fusion materials and technologies
- Thermal Expansion and Ionic Conductivity
- Integrated Circuits and Semiconductor Failure Analysis
- Solid-state spectroscopy and crystallography
- Microstructure and mechanical properties
- Advanced Mathematical Theories and Applications
- Nuclear materials and radiation effects
- Algebraic and Geometric Analysis
- Advanced ceramic materials synthesis
- Geometric and Algebraic Topology
- Magnetic and transport properties of perovskites and related materials
- Advanced Surface Polishing Techniques
- Ferroelectric and Piezoelectric Materials
United Kingdom Atomic Energy Authority
2021-2023
Culham Science Centre
2021-2023
Imperial College London
2019
Google (United States)
2015
Warwick Hospital
2015
Zirconium alloys are widely used as the fuel cladding material in pressurised water reactors, accumulating a significant population of defects and dislocations from exposure to neutrons. We present interpret synchrotron microbeam X-ray diffraction measurements proton-irradiated Zircaloy-4, where we identify transient peak subsequent saturation dislocation density function exposure. This is explained by direct atomistic simulations showing that observed variation dose natural result evolution...
To specify a grain boundary at macroscopic length scale requires the specification of five degrees freedom. We use in which three freedom associated with misorientation are an orthogonal subspace from two mean plane. By using Rodrigues vectors to describe rotations, we show how paths through these subspaces may be characterized. Some correspond physical processes involving boundaries during microstructural evolution. Exploiting orthogonality subspaces, metric measure ‘distance’ between is...
We present an ab initio simulation of 90° ferroelastic twins that were recently observed in methylammonium lead iodide. There are two inequivalent types walls we calculate to act as either electron or hole sinks, which leads us propose a mechanism for enhancing charge carrier separation photovoltaic devices. Despite separating nonpolar domains, show these have substantial in-plane polarization ∼6 μC cm-2, due part flexoelectricity. suggest this turn could allow the photoferroic effect and...
Using atomistic simulations based on the creation-relaxation algorithm, we explore evolution of microstructure in irradiated zirconium over a broad range radiation exposure. In agreement with experimental observations, find that at relatively low temperatures, evolves towards an asymptotic dynamic steady state forming doses close to 1 dpa. Simulations show spontaneous formation $a$-type interstitial dislocation loops, gradually transforming into extended network and giving rise macroscopic...