Impedance and Mössbauer spectroscopy study of BiCu3Ti3FeO12 dielectric matrix

• Autor(a) principal: Freitas, Daniel Barros de
• Data de Publicação: 2021
• Outros Autores: Bezerra Júnior, Manoel Henrique, Oliveira, Ronaldo Glauber Maia de, Morais, José Eduardo Vasconcelos de, Bessa, Valéria Lima, Carmo, Felipe Felix do, Pereira, Mariana Sá, Vasconcelos, Igor Frota de, Silva, Marcelo Antonio Santos da, Andrade, Humberto Dionísio de, Queiroz Júnior, Idalmir de Souza, Silva, Ronaldo Santos da, Sombra, Antônio Sérgio Bezerra
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• dARK ID: ark:/83112/001300001622n
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/67326
• topic: X-ray diffraction; Mössbauer spectroscopy; BCTFO ceramic

In the present work, an electroceramic of the perovskite family, BiCu3Ti3FeO12 (BCTFO), was synthesized by the solid-state reaction method. The structural study was performed by X-ray diffraction and Mössbauer and Raman spectroscopy. Electric and dielectric properties were analyzed by impedance spectroscopy and the Hakki-Coleman method. Due to the BCTFO is isostructural of the CaCu3Ti4O12 (CCTO), the BCTFO presents as a promissory electroceramic. Mössbauer spectroscopy reveals paramagnetic spectra to BCTFO, with two octahedral sites for iron ions. Regarding dielectric properties, for 1 Hz, BCTFO presents a high relative dielectric permittivity (εr ≈ 1 × 104) and dielectric loss (tan δ > 1) and εr = 230.88, tan δ ≈ 1 × 10–2 in the microwave range. The produced ceramic exhibited a high resonance frequency temperature coefficient (τf) with a value of + 2852 ppm °C−1, making it a candidate for fabrication of the thermostable electroceramic composites with other ceramic matrices with negative τf values improving the thermal stability.