SYNTESHIS AND CHARACTERIZATIONS OF CERAMICS COMPOSITES BASED ON BaSn(1-x)Ti(x)O3 IN THE FORM OF POWDERS AND BULKS FOR OPTICAL AND ELECTRICAL APPLICATIONS

• Grant number: 21/08648-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2021
• End date: March 31, 2023
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Miguel Ángel Ramírez Gil
• Grantee: Marcos Henrique da Silva Silvestre
• Host Institution: Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

Scientific and technological advances nowadays grow together with the demand for multifunctional materials with improved properties. One of the strategies adopted by researchers and reported in the literature to enhance the properties of a material is the synthesis of composites or systems that start from the idea of ion substitution. The stannates and titanates class have been receiving good attention from researchers due to their multifunctionality. The application of these materials is wide due to their good optical, dielectric and piezoelectric properties, among others. BaSnO3 (BSO) and BaTiO3 (BTO) are highlighted when compared to other materials in this class for their excellent photocatalytic activity (pure BSO and doped BTO), good dielectric (BSO and BTO), ferroelectric and piezoelectric (BTO) properties. The objective of this work is to evaluate the influence of the replacement of Sn4+ ions by Ti4+ in the ceramic system BaSn(1-x)Ti(x)O3 (BSTO) in the form of powders and bulks, for values of x = 0.0; 0.05; 0.10; 0.15 and 0.20 considering that these systems have been little explored in the literature regarding their optical (photoluminescent and photocatalytic), dielectric and non-ohmic properties. Ceramic powders will be synthesized by the solid state reaction method and, based on these, it will be possible to sinter the bulks in a conventional furnace at suitable temperatures. The (micro)structure of the ceramic system powders will be investigated by X-ray diffraction (XRD), Raman and visible ultraviolet spectroscopy (UV-vis) and scanning electron microscopy (SEM), and the optical properties will be investigated through the evaluation of the photoluminescent and photocatalytic response. Ceramic bulks will be characterized as to their structure by XRD and SEM. The techniques of impedance spectroscopy (IS) and current-voltage measurements (I-V) will be used to determine the dielectric and non-ohmic behavior.