Simulations of void-filled vitreous silica to interpret the origin of the first sharp diffraction peak
- 1 September 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 50 (9), 5981-5987
- https://doi.org/10.1103/physrevb.50.5981
Abstract
It has been proposed that the first sharp diffraction peak (FSDP) in the structure factor of covalent glasses is a prepeak in the concentration-concentration structure factor due to the chemical ordering of interstitial voids around cation-centered clusters in the structure. This void-based model predicts that if voids are occupied by extrinsic atoms the intensity of the FSDP will change. Dramatic changes in the FSDP have been observed by calculating the structure factor for a model of vitreous silica whose interstices were filled with He, Li, and Na. Moreover, a splitting of the FSDP has been observed in the case of the Na-filled model, similar to that observed experimentally for potassium silicate glasses. The origin of this splitting is found to arise from subtle cancellation effects among the partial structure factors.Keywords
This publication has 17 references indexed in Scilit:
- The origin of the first sharp diffraction peak in the structure factor of covalent glasses and liquidsJournal of Physics: Condensed Matter, 1992
- Medium-range structural order in covalent amorphous solidsNature, 1991
- Origin of the first sharp diffraction peak in the structure factor of covalent glassesPhysical Review Letters, 1991
- Theoretical study of the interstice statistics of the oxygen sublattice in vitreousPhysical Review B, 1991
- Sphere and distance models for binary disordered systemsPhilosophical Magazine Part B, 1990
- The structure of silver/germanium/selenium glassJournal of Non-Crystalline Solids, 1988
- The lognormal distribution in the random network structureJournal of Non-Crystalline Solids, 1981
- The short-range structure of alkali disilicate glasses by pulsed neutron total scatteringJournal of Non-Crystalline Solids, 1980
- Pressure dependence of helium and neon solubility in vitreous silicaJournal of Applied Physics, 1976
- Structural Aspects of the Electrical Resistivity of Binary AlloysPhysical Review B, 1970