ESR and optical studies of Mo5+ and W5+ ions in phosphomolybdate and phosphotungstate glasses

Abstract ESR and optical studies of phosphomolybdate and phosphotungstate glasses are discussed. Both the ESR and optical results indicate that molybdenum or tungsten ions are present in distorted octahedral environments in these glasses. In addition, ESR spectra of Mo 5+ and W 5+ ions show that the d electrons are localized on molybdenum and tungsten sites respectively. The variation of g ⊥ and g ∥ values has been examined using appropriate structural models of these glasses.