The influence of the synthesis method on the characteristics of BaTiO3

• Autor(a) principal: Almeida, G. N.
• Data de Publicação: 2023
• Outros Autores: Souza, Rodrigo Nunes de, Lima, L. F. S., Mohallem, Nelcy Della Santina, Silva, Edson Paulo da, Silva, Alysson Martins Almeida
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UnB
• Texto Completo: http://repositorio2.unb.br/jspui/handle/10482/49206; https://doi.org/10.3390/ma16083031; https://orcid.org/0000-0002-6200-3253; https://orcid.org/0000-0002-9094-4536
• topic: Titanato de bário; Processos sol-gel; Propriedades elétricas

In this work, barium titanate powders were produced by sol-gel and sol-precipitation methods from metal alkoxides. In the sol-gel method, tetraisopropyl orthotitanate was mixed with 2-propanol, acetic acid and barium acetate and the gel samples obtained were calcined at 600 °C, 800 °C and 1000 °C. Through the sol-precipitation method, tetraisopropyl orthotitanate was mixed with acetic acid and deionized water and precipitated by addition of a concentrated solution of KOH. The products were calcined at various temperatures and the microstructural and dielectric properties of BaTiO3 prepared for the two processes were analyzed and compared. The result of these analyzes allowed to observe in the samples produced by the sol-gel method an increase in the tetragonal phase and the dielectric constant (15 – 50 at 20 kHz) with increasing temperature, while the sample obtained by sol precipitation was cubic. The presence of BaCO3 is more evident in the sample produced by sol-precipitation and the band gap of the products obtained did not show significant variation, changing the synthesis method (3.363 - 3.594 eV).