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Type: 
Journal
Description: 
The mid-range structure of glasses of the glass-forming system xNb2O5–(60 – x)P2O5–40Na2O, with x varying from 0 to 40, has been investigated by Raman spectroscopy and electro-optical Kerr measurements. It was found that the mid-range inhomogeneities in the glasses under study vary with x and their compositions and structures dramatically differ from the gross glass composition. It is shown that inhomogeneities with the 8NaNbO3 + (Nb2O5·P2O5) composition are responsible for the electro-optical sensitivity of the glasses. The electro-optical structural elements of the inhomogeneities of this type are assumed to be fragments of the quasicubic lattice of crystalline NaNbO3 demonstrating a rather high electro-optic Kerr coefficient. The obtained results are discussed in terms of the concepts of constant stoichiometric groupings and crystal motifs.
Publisher: 
American Chemical Society
Publication date: 
7 Feb 2013
Authors: 

AA Lipovskii, DK Tagantsev, IE Apakova, TS Markova, OV Yanush, MG Donato, L Sirleto, G Messina, GC Righini

Biblio References: 
Volume: 117 Issue: 5 Pages: 1444-1450
Origin: 
The Journal of Physical Chemistry B