The effect of oxide impurity on the physical properties of fluorozirconate glass

The effect of oxide impurity on the physical properties of 62ZrF 48LaF 330BaF 2 (mol.%) glass was studied by equimolecular substitution of BaO for BaF 2. It is shown that the oxide impurity decreases the infrared transparency beyond 6 μm, shifts the transmission cut-off wavelength to higher frequencies and causes an additional absorption shoulder at 1350 cm −1. The oxide impurity also increases the glass transition temperature, the crystallization temperature and the viscosity of the melt. The additional infrared absorption of oxide impurity in the fluorozirconate glasses results from the multiphonon process of the vibration of FZrO bonds at ∼680 cm −1.