Title

Structure and nonlinear optical properties of sodium-niobium phosphate glasses

Authors

Authors

A. Flambard; J. J. Videau; L. Delevoye; T. Cardinal; C. Labrugere; C. A. Rivero; M. Couzi;L. Montagne

Comments

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Abbreviated Journal Title

J. Non-Cryst. Solids

Keywords

phosphates; NMR; MAS-NMR and NQR; structure; XPS; BOROPHOSPHATE GLASSES; SILICATE-GLASSES; NMR; RAMAN; SPECTROSCOPY; SPECTRA; ORIGIN; SYSTEM; OXIDES; FIBER; Materials Science, Ceramics; Materials Science, Multidisciplinary

Abstract

The structural description of xNb(2)O(5)-(1 - x)(NaPO3) (0 <= x <= 0.40) glass network is reported through high-field (18.8 T) O-17 and Nb-93 nuclear magnetic resonance, O1s X-ray photoelectrom 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 P-31 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 NbO6 octahedra, mainly for x > 0.2, which is related to the incomplete dissociation of Nb2O5 in the NaPO3 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. (C) 2008 Elsevier B.V. All rights reserved.

Journal Title

Journal of Non-Crystalline Solids

Volume

354

Issue/Number

30

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

3540

Last Page

3547

WOS Identifier

WOS:000257590400004

ISSN

0022-3093

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