Ciclo Semanal de Seminários do CCMC com Thiago Amaral

Residual stress effects on planar BaTiO3/BaTi1-xZrxO3 ceramic composites

Abstract: In this seminar, the microstructure and the dielectric properties of BaTiO3/BaTi1-xZrxO3 composites will be correlated. It will be showed that the Zr4+ substitution of Ti4+ changes the dilatometry behavior of the BaTi1-xZrxO3 compounds, therefore leading to residual two-dimensional stresses on the composites after ceramic processing. As BaTiO3´s dielectric properties are affected by two-dimensional stresses, their effects can be tracked by comparing the composites´ dielectric properties with predictions obtained by the simple mixture rule focused on BaTiO3 paraelectric/ferroelectric phase transition. The results show that the composites’ dielectric properties can be tuned through control of the microstructure and that it´s possible to achieve properties higher than the expectations. The BaTi1-xZrxO3 nanopowders were synthesized by the hydrothermal and by the polymeric precursors method. Ceramic composites with different grain sizes were obtained by tape casting and by the traditional ceramic processing route with sintering temperature of 1300 °C. Their structure, microstructure and dielectric properties were characterized and compared to those of homogeneous samples prepared under the same conditions.

Seminarista: Thiago Amaral – doutorando do Grupo de Pesquisa Crescimento de Cristais e Materiais Cerâmicos

Data: 12/05/2015

Local: Sala F-202 (Prédio dos Laboratórios de Ensino do IFSC)

Horário: Das 16h às 17h

Amanda Murgo
Sobre Amanda Murgo 134 Artigos
Educadora do Laboratório de Difusão Científica (LaDiC) do Grupo Crescimento de Cristais e Materiais Cerâmicos (CCMC/IFSC/USP) no âmbito das ações de Difusão Científica do CDMF. Assessora de Comunicação do CCMC/LaDiC/CDMF desde 2010. Bacharel em Filosofia pela Universidade Federal de São Carlos com estágio no Projeto "História da Ciência e Meio Ambiente - as demandas por energia através da História" (CCMC/IFSC/USP/CDMF) de abril de 2013 a julho de 2014. Atua ministrando cursos de Educação Ambiental em escolas de Rede Básica de Ensino e Educadores com a temática pelo CDMF até os dias atuais.