Efeito da potência de sonicação sobre as propriedades estruturais e elétricas do sistema cerâmico Na2Ti3O7/Na2Ti6O13

Abstract

The sodium titanate family presents itself as a strong candidate for components in sodium ion batteries due to their interesting ion exchange semiconductor characteristics. Studies are being conducted to improve the exposure pathways and use of these materials, changes in the level of structure and microstructure that allow better characteristics in the chemical properties of materials used. The present work presents a sonochemical pathway as the synthesis route of sodium titanate. For this, the power of the probe was used as a variable and a fixed time of 15 minutes. The study allowed to investigate the influence of this parameter on the properties and how they influence the electrical properties of the Na2Ti3O7/Na2Ti6O13 ceramic system. Techniques such as X-ray Diffraction, RAMAN Spectroscopy, DSC / DTA and Complex Impedance Spectroscopy were used for color characterization. A coexistence of semicrystalline aspect phases is found for all powers used. However, it was possible to achieve a single phase of Na2Ti6O13 65% of power and heat treatment at 900 ° C / 1h. with characteristic stretches created; In order to perform electrical characterization tests as well as density, pellets were made and sintered at 900 ° C / 1h; Through the Scherrer equation, the crystal size is determined by obtaining average values between 52.55 nm and 73.5 nm. The density of ceramic colors was determined by the Archimedes method, reaching relative density values between 69.32% and 81.32% were calculated The complex impedance test was performed for all power range conditions and was synthesized at 20% power, which has the best electrical response with a conductivity value of 10-4 S/cm.