Authors: Li, Hong; Li, Liyu; Strachan, D.M.

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 46, Number 4, August 2005 , pp. 412-419(8)

Publisher: Society of Glass Technology

Abstract:

Judd–Ofelt (JO) theory derived oscillator strength parameters (Ω₂, Ω₄, Ω₆) of electronic transitions of the trivalent lanthanides (Ln) qualitatively describe the local Ln environment. Recently, we have systematically studied the JO parameters as a function of Nd concentration in a single Na-rich aluminoborosilicate glass. Based on Nd partitioning scheme as its dissolution mechanism for borosilicate glasses, we simulated the extent of borate saturation by Nd as a function of Nd concentration using a stable local Nd-metaborate structure derived from our previous studies. The best results indicated that the first onset of the Ω₂ discontinuity resulted from the saturation of the borate sites by Nd. Combining with our earlier study of the JO parameters for an Al-rich borosilicate glass without Na, we further conclude that the index of saturation of boron by Nd, IS_[B]=[Nd₂O₃]_B-site/1/3{[B₂O₃]_ex+[Al₂O₃]_ex}, provides a general physical description of Nd partitioning in the borate sites for complex Na₂O–Al₂O₃–B₂O₃–SiO₂ glasses, whereas for the Na-rich glass reported in this study, [Al₂O₃]_ex=0.

Document Type: Research article

Publication date: 2005-08-01

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