Dielectric and structural studies of a SiO2-Li2O-Nb2O5 glass and glass-ceramic prepared by the sol-gel method

abstract

The preparation and properties, of nanocrystals embedded in a glass matrix have recently received a considerable amount of interest. The glass composition 92SiO(2)-4Li(2)O-4Nb(2)O(5) (mol%), prepared by the sol-gel route gives origin to a transparent and colorless gel. The dried gel was heat-treated at temperatures between 500 and 750 degrees C, with and without the presence of an external electrical dc field. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman and dielectric spectroscopy were used to characterize the glass samples. In the samples heat-treated at 650 degrees C with 1000 kV/m and in the 700 and 750 degrees C samples series, LiNbO3 crystallites, an important ferroelectric material is present. The behavior of the dc conductivity and the dielectric constant, in the glass and glass-ceramic, reflects the important effect of the temperature and the applied electric field on the sample structure. (c) 2005 Elsevier B.V. All rights reserved.

keywords

ELECTRICAL-PROPERTIES; SILICATE-GLASSES

subject category

Materials Science

authors

Graca, MPF; da Silva, MGF; Valente, MA

our authors

Groups

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".