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RESEARCH PRODUCT
Intermediate Range Order in Silicate Melts and Glasses: Computer Simulation Studies
Walter KobJürgen HorbachAnke WinklerKurt Bindersubject
Range (particle radiation)Materials scienceSodiumThermodynamicschemistry.chemical_elementMineralogySodium silicateSilicatechemistry.chemical_compoundchemistryExponentTetrahedronStructure factorConstant (mathematics)description
ABSTRACTWe present the results of large scale computer simulations to discuss the structural and dynamic properties of silicate melts with the compositions (Na2O)(2·SiO2), (Na2O)(20·SiO2) and (Al2O3)(2·SiO2). We show that these systems exhibit additional intermediate range order as compared to silica (SiO2) where the characteristic intermediate length scales stem from the tetrahedral network structure. Furthermore we show that the sodium dynamics in the sodium silicate systems exhibits a very peculiar feature: the long–time decay of the incoherent intermediate scattering function can be described by a Kohlrausch law with a constant exponent β for q > qth whereby qth is smaller than the location of the main peak in the static structure factor for the Na–Na correlations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-01-01 | MRS Proceedings |