OPTICAL ABSORPTION SPECTRA OF PbO - Ga 2 O 3 - P 2 O 5 : WO 3 GLASSES

Lead gallium phosphate glasses (PbO - Ga 2 O 3 - P 2 O 5 ) containing different concentrations of tungsten oxide (WO 3 ) ranging from 0 to 5 mol% were prepared. Optical absorption spectra have been carried out. The optical absorption measurements on all the glasses suggest the redu ction of W 6+ ions in to W 5+ ions with higher percentage in glass PGPW 1.