Fictive temperature of GeO2 glass: Its determination by IR method and its effects on density and refractive index

A simple IR method of determining the fictive temperature of GeO₂ glass, both surface and bulk, was developed using the same technique developed earlier for silica glass. Specifically, IR absorption and reflection peak wavenumbers of GeO₂ structural bands were found to be correlated with the fictive temperature of the glass. Using this method structural relaxation kinetics can be investigated. Density and refractive index of GeO₂ glass were also measured as a function of fictive temperature.