Spectroscopic Study of Neodymium(III) in Sodium Tellurite Glass

The local environment of Nd‐O in a sodium tellurite glass was elucidated as a function of Nd 2 O 3 concentration, from 0.1 to 2.5 mol%, using optical spectroscopy. The Judd‐Ofelt (J‐O) theory was used to determine the oscillator strength parameters (J‐O parameters) of the glasses. According to the J‐O parameters, a significant change in the local environment of Nd‐O was suggested for the glass containing 1 mol% Nd 2 O 3 ; the asymmetry of the Nd‐O crystal field was shown to be at a maximum and the bond covalency at a minimum. The results were further supported by a significant shift of the structural hypersensitive band of the glass with 1 mol% Nd 2 O 3 , as compared with those of the other glasses.