Structural aspects of Judd–Ofelt oscillator strength parameters: relationship between Nd dissolution and its local environments in borosilicate glasess

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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: August 1, 2005

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