Channel Formation and Intermediate Range Order in Sodium Silicate Melts and Glasses
Andreas MeyerPhysik Department E 13, Technische Universität München, 85747 Garching, Germany. [email protected]Jürgen HorbachInstitut für Physik, Johannes Gutenberg–Universität Mainz, 55099 Mainz, GermanyWalter KobLaboratoire des Verres, Université Montpellier II, 34095 Montpellier, FranceFlorian KarglPhysik Department E 13, Technische Universität München, 85747 Garching, GermanyH. SchoberInstitut Laue–Langevin, 38042 Grenoble, France
2004en
ABI
Annotatsiya
We use inelastic neutron scattering and molecular dynamics simulation to investigate the interplay between the structure and the fast sodium ion diffusion in various sodium silicates. With increasing temperature and decreasing density the structure factors exhibit an emerging prepeak around 0.9 A(-1). We show that this prepeak has its origin in the formation of sodium rich channels in the static structure. The channels serve as preferential ion conducting pathways in the relative immobile Si-O matrix. On cooling below the glass transition this intermediate range order is frozen in.
Hali tarjima qilinmagan
Identifikatorlar
Iqtiboslar va manbalar
2 ta iqtibos0 ta foydalanilgan manba