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

Using the molecular dynamics technique, porous glasses of several dens ities have been simulated. Lattice distortions and development of non- bonding oxygens number are analysed. We emphasize the role of these ch aractristics for the doping of glasses. Europium-dopes silica glasses have also been simulated. The comparison between glases of different d ensities 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 v ariations of the Stark splitting.