Estudo de propriedades estruturais e elétricas da cerâmica SRBI2NB2O9 fabricada por moagem de alta energia

• Autor(a) principal: Sancho, Emmanuelle de Oliveira
• Data de Publicação: 2012
• Outros Autores: Freitas, Daniel Barros de, Silva Filho, José Miranda da, 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/55907
• topic: Método do estado sólido; Moagem de alta energia; Materiais ferroelétricos

Was synthesized compounds of bismuth, SrBi2Nb2O9 (SBN) by the method of solid state by high energy milling reactor polymeric beads zirconia, and to it were added to concentrations of 3, 5, 10 and 15% bismuth oxide (Bi2O3) in order to promote intentional changes in the chemical structure of the ceramic. In this work we studied the structural and electrical properties (in the region of 10Hz to 100MHz). Was obtained diffractograms showing the formation of phase, and by Rietveld refinement confirmed the orthorhombic crystal structure with lattice parameter (a = 5.5129Å, b = 5.5183Å and c = 25.0819Å, α = β = γ = 90º) convergence rates for S = 1.59 (goodness of fit), where S is given by the ratio Rwp/Rexp. The dielectric permittivity and dielectric loss were directly related to the porosity using density measurements obtained.