MOLECULAR-DYNAMICS SIMULATION OF POROUS SILICA GLASSES - TRIVALENT EUROPIUM ION DOPING CASE

Using the molecular dynamics technique, porous glasses of several densities have been simulated. Lattice distortions and development of non-bonding oxygens number are analysed. We emphasize the role of these charactristics for the doping of glasses. Europium-dopes silica glasses have also been simulated. The comparison between glases of different densities allows us to understand the doping of silica by europium. In particular, we can explain the low coordination (< 4) obtained in this glass. explained by the simulation results: broadening of lines and variations of the Stark splitting.