Radiation Damage effects in alkali silicate glasses Thorsten Stechert Imperial College London 15/16 December 2010 Manchester Supervised by: Prof. Robin Grimes and Dr. Luc Vandeperre. Outline. Problem definition Modelling glasses Radiation damage effects Conclusions Further Work.
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Radiation Damage effects
in alkali silicate glasses
Imperial College London
15/16 December 2010
Supervised by: Prof. Robin Grimes and Dr. Luc Vandeperre
Modelling can help to isolate processes and trends, to help us understand:
The potential energy of the Si-O pair interaction (Pedone potential)
Modelled silicate glass with 30 mol% Na2O content. Si shown in yellow, O in red and Na in blue.
A comparison of the simulated total correlation function with neutron diffraction data by Wright et al. (Qmax = 22.88Å).
Evolution of a 10 keV silicon cascade: showing atoms displaced by 5 Å or more, with trajectories (a) and displaced atoms (b) shown after 50 timesteps.
The evolution of damage is shown after 100 timesteps (c) and 250 timesteps (d).
Change in ring size after 50 cascades
Change in network connectivity after 50 cascades
Thank you for listening!
We would like to thank the DIAMOND consortium, the EPSRC and the Nuclear Decomissioning Authority (NDA) for funding this work