Produção da cerâmica ferroelétrica SrBi2Nb2O9 (SBN) por moagem de alta energia e sua caracterização.

• Autor(a) principal: Sancho, Emmanuelle de Oliveira
• Data de Publicação: 2011
• Outros Autores: Pires Júnior, Guilherme Francisco de Morais, Rodrigues, Herbert de Oliveira, Sales, Juscelino Chaves, Sombra, Antônio Sérgio Bezerra
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/55877
• topic: Método do estado sólido; Moagem de alta energia; Materiais ferroelétricos

Bismuth compounds, such as SrBi2Nb2O9 (SBN), lead-free, is an alternative to the use of PZT because of its excellent ferroelectric properties, especially regarding the change of polarization. SBN is synthesized by the method of the solid state by high energy ball milling in reactive polymer with zirconia beads, which were subsequently doped with Bi2O3 and La2O3 aiming to promote intentional changes in the chemical structure of the ceramic, resulting in changes in properties electrical, magnetic and optical materials. The quantitative analysis obtained by Rietveld refinement confirmed the orthorhombic crystal structure with lattice parameters (a = 5.5158 Å, b = 5.5133 Å and c = 25.0765 Å, α = β = γ = 90 °) for indices convergence S = 1.72 (goodness of fit), where S is given by the ratio RWP / Rexp. And, the Raman shifts at 174, 204, 570 and 834 cm-1 indicated the formation of SBN perovisquita type.