Fano׳s antiresonance and crystal-field study of Cr3+ in metaphosphate glasses

Abstract This work is devoted in first part to a study of the features observed on the 4 T 2g ( 4 F) absorption band of phosphate glasses containing Cr 3+ . These features results from interaction of the 2 E g ( 2 G) and 2 T 1g ( 2 G) sharp levels with the vibrationally broadened 4 T 2g ( 4 F) quasi-continuum via spin–orbit coupling and have been analyzed in the frame of the Fano׳s antiresonance model. In second part, the electronic structure of Cr 3+ ion occupying Oh site symmetry in the phosphate glasses is determined by the crystal-field analysis. The influence of the different oxides (Na 2 O, PbO, ZnO) on the spectroscopic properties of Cr 3+ is evaluated. In metaphosphate glasses, we found that Na 2 O and PbO oxides act as glass modifiers while ZnO enters the glass forming network.