Density and density fluctuations anomalies of SiO₂ glass: comparison and light-scattering study

Abstract

The objective of this work is to compare density and density fluctuations of silica as a function of temperature in the anomalous domain between 950 and 1480°C via Archimedes’ macroscopic measurements and light scattering. Parallel qualitative behaviour is also recorded between density fluctuations and macroscopic density. Density fluctuations of silica show a minimum as a function of temperature, as with macroscopic density. This correlation indicates a possible common origin of both observations.

Acknowledgments

The authors are grateful to J.P. Simon (ESRF-D2AM, beam line) and the ERSF staff for SAXS experiments, and to the CECOMO (Université Lyon1) for the use of the Raman facilities.