UV transparency and structure of fluorophosphate glasses

摘要: Abstract Ultraviolet (UV) transparency and local structural environment of fluorophosphate glasses in the Ba(PO3)2–MgF2–CaF2–AlF3 system have been studied with increasing fluoride content (covering whole compositional range) by infrared (IR) reflection spectroscopy (IRRS) conjunction 31P magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. UV cutoff shifts towards longer wavelength up to ∼36 mol%. IRRS spectra indicate a gradual increase nonbridging oxygens (NBOs) this region. According MAS NMR spectra, it is due combined effects Q1 sites P–O–Al bridges (increase optical basicity). Beyond mol% content, shorter wavelength. It attributed decrease NBOs or (decrease basicity) as revealed respectively. In region, true partial role metal fluorides controlling has found contribute significantly well.