DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DF: Dielektrische Festkörper

DF 7: Gl
äser I (gemeinsam mit FV DY)

DF 7.6: Vortrag

Montag, 7. März 2005, 11:30–11:45, TU A060

Intermediate range order and transport processes in viscous aluminium silicates: A computer simulation study — •Patrick Pfleiderer, Jürgen Horbach, and Kurt Binder — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, D-55099 Mainz, Germany

Glassforming mixtures of SiO2 with Al2O3 with different compositions are investigated by molecular dynamics (MD) computer simulations. These systems form tetrahedral network structures, i.e. both Al and Si are four-fold coordinated by oxygens. We show that these systems exhibit intermediate range order (IRO) that is reflected by prepeaks in partial static structure factors around 0.5 Å−1. The underlying structure is a microphase-separated system where Al-O-rich regions form a percolating network through the Si-O structure. We study how the latter IRO is reflected in dynamical quantities such as the Debye-Waller factor and wave-vector dependent relaxation times.In the temperature range under investigation, i.e. for T>2000 K, structural relaxation can be well described by mode coupling theory.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2005 > Berlin