Abstract
Novel glass-ceramic nano-composites based on BaTiO3-V2O5-Bi2O3 glasses were prepared via heat-treatment at crystallization temperature (T-cr). The nanostructural and ferroelectric properties were investigated by differential scanning calorimeter (DSC), transmission electron microscope (TEM), X-ray diffraction (XRD) and dielectric measurements, respectively. It was shown by XRD and TEM studies that appropriate heat-treatment glasses can turn into glass-ceramic nano-composites consisting of crystallites smaller than 30 nm embedded in the glassy matrix. The observed dielectric constant of heat-treated samples, showed average broad peak around 324 K. The average Curie temperature (T-c) observed around 324 K in the present system. This observation of these glass-ceramic nano-composites can be utilized to control T-c by proper adjustment of BaTiO3 content. This result. therefore. supports dipolar orientation and phase transition in the glass-ceramic samples dispersed with nanocrystalline BaTiO3. Such a feature can be used for industrial applications where the shape of the application article is a necessary requirement such as integrated capacitor. (C) 2012 Elsevier B.V. All rights reserved.