Structure and nonlinear optical properties of sodium–niobium phosphate glasses

The structural description of xNb 2O 5–(1 − x)(NaPO 3) (0 ⩽ x ⩽ 0.40) glass network is reported through high-field (18.8 T) 17O and 93Nb nuclear magnetic resonance, O1s X-ray photoelectron spectroscopy and Raman spectroscopy. The different oxygen sites (POP, PONa, NbOP and NbONb) are resolved on the...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2008-07, Vol.354 (30), p.3540-3547
Main Authors: Flambard, A., Videau, J.J., Delevoye, L., Cardinal, T., Labrugère, C., Rivero, C.A., Couzi, M., Montagne, L.
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
Glasses
MAS-NMR and NQR
Material chemistry
NMR
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Phosphates
Physics
Structure
Structure of solids and liquids
crystallography
XPS
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Summary:The structural description of xNb 2O 5–(1 − x)(NaPO 3) (0 ⩽ x ⩽ 0.40) glass network is reported through high-field (18.8 T) 17O and 93Nb nuclear magnetic resonance, O1s X-ray photoelectron spectroscopy and Raman spectroscopy. The different oxygen sites (POP, PONa, NbOP and NbONb) are resolved on the spectra, their relative proportion determined and compared to indirect calculations obtained from the decomposition of 31P NMR spectra. A good agreement is obtained, thus confirming the formation of the Nb(OP) 6− y (ONb) y units with increasing y leading to the clusterization of NbO 6 octahedra, mainly for x > 0.2, which is related to the incomplete dissociation of Nb 2O 5 in the NaPO 3 melt. The formation of these clusters is responsible for the large increase of the nonlinear optical properties, mainly due to the high polarizability of the Nb–O–Nb bond.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2008.03.017