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• W2022024062 abstract "Abstract The local atomic structure around Nd and Al ions present as dopants in SiO 2 glasses and as major constituents in other silicate glasses have been studied using Nd L III -edge EXAFS and Al K-edge XANES and EXAFS spectroscopy. The Nd EXAFS results provide the first direct evidence of clustering of Nd ions through the formation of Nd–O–Nd bonds in a SiO 2 glass doped with 2400 ppm Nd 2 O 3 . The Nd–O and Nd–Nd distances in this glass are found to be 2.35 and 3.80 A, respectively. Codoping of this glass with 7300 ppm Al 2 O 3 is shown to result in a homogeneous dispersion of the Nd atoms. The Nd–O coordination polyhedra in this glass relax to a larger volume with respect to that in its Al-free counterpart with a significant increase in the Nd–O distance to 2.62 A. Moreover, Nd–O–Si/Al bonds are formed at the expense of Nd–O–Nd bonds on addition of Al, indicating incorporation of Nd–O polyhedra into the silicate network; the corresponding Nd–Si distance is found to be 3.51 A. A similar atomic environment for Nd is also observed in Nd 2 Al 2 Si 3 O 12 glass where Nd is present as a major component rather than as a dopant. However, no such Nd–O–Si bonds are observed in a K–Nd-silicate glass indicating the fact that incorporation of Nd–O polyhedra into the silicate network without Al creates significant radial disorder in the next-nearest neighbor Si shell around Nd. The Al XANES and EXAFS spectra indicate that Al ions in all these glasses exist in four-fold coordination with Al–O distances ranging between 1.76 and 1.77 A. A second shell of Si is observed in all compositions at distances ranging between 2.92 and 3.00 A. Al–O–Nd bonds are also observed in the Nd 2 Al 2 Si 3 O 12 glass. It is suggested that Nd, when incorporated into the Si, Al–O network, plays the role of charge-balancing cation for [AlO 4 ] −1 units in aluminosilicate glasses." @default.
• W2022024062 created "2016-06-24" @default.
• W2022024062 creator A5046083743 @default.
• W2022024062 date "2000-01-01" @default.
• W2022024062 modified "2023-10-17" @default.
• W2022024062 title "Atomic environment of high-field strength Nd and Al cations as dopants and major components in silicate glasses: a Nd LIII-edge and Al K-edge X-ray absorption spectroscopic study" @default.
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• W2022024062 doi "https://doi.org/10.1016/s0022-3093(99)00564-5" @default.
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