The mid-range structure of glasses of the glass-forming system xNb 2O5-(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 + (Nb2O 5·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.
Mid-range structure of niobium-sodium-phosphate electro-optic glasses / Lipovskii, A. A.; Tagantsev, D. K.; Apakova, I. E.; Markova, T. S.; Yanush, O. V.; Donato, M. G.; Sirleto, L.; Messina, Giacomo; Righini, G. C.. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - 117:5(2013), pp. 1444-1450. [10.1021/jp3081244]
Mid-range structure of niobium-sodium-phosphate electro-optic glasses
MESSINA, Giacomo;
2013-01-01
Abstract
The mid-range structure of glasses of the glass-forming system xNb 2O5-(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 + (Nb2O 5·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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
