Influence of Cu3+ on the structure of Bi0.5Na0.5TiO3 - BaTiO3 in the form of thin films produced by the sol - gel method

Abstract

Concern for the environment has gradually increased in recent years. As a result, some materials considered aggressive to the environment have lost space, leading the industry to look for new materials. Lead compounds are commonly used as piezoelectric materials. These are applied in various technological areas, such as electronics, where they function as an active element in sensors, transducers, and generators. The bismuth sodium titanate compound Bi0.5Na0.5TiO3BaTiO3 (BNT-BT) is considered one of the most favorable substitution materials. This statement is based on its ferroelectricity, piezoelectricity and relatively high Curie temperature. This work aims to verify the influence of the chemical element copper (Cu) on the structure of BNT-BT films deposited on Pt / Ti / SiO2 / Si substrate for possible industrial applications, such as nanogenerators and energy storage devices. BNT-BT-Cu precursor solutions were prepared by the sol-gel method, obtaining good homogeneity and viscosity at room temperature. The deposition method of the precursor solutions was spin coating, due to its low cost and good homogeneity of the films in short time and low sintering temperature. The films were characterized by x - ray diffraction technique, scanning electron microscopy and Raman spectroscopy.