Abstract
An investigation of the optical absorption spectra of 1 mol% Nd 2O 2 in sodium borate glasses with Na 2O contents varying from 7.5 to 40 mol% is presented. The glasses were obtained by quenching melts consisting of Na 2CO 3, H 3BO 3, and Nd 2O 3 (900 to 1100°C, 1.5–2 h) between steel plates. The optical absorption spectra were recorded at 300 and 20 K. Special emphasis is laid on the positions, half-widths, intensities and shapes of the 4 I 9 2 → 2 P 1 2 and the hypersensitive 4 I 9 2 → 4 G 5 2 , 2 G 7 2 transitions. The observed property versus composition variations are discussed in terms of the covalency of the neodynamium-oxygen bond and of changes induced into the crystalline field around the Nd 3+ ions by structural changes of the glass matrix. The shape of the hypersensitive transition is used for comparison with existing models on the rare earth environment in oxide glasses.
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