Multifuncional translucent ferroelectric Ba1-xCaxTiO3 ceramics produced by laser sintering

Journal of the European Ceramic Society 36 (2016) 4023–4030

Fig.: (a) P-E hysteresis loops of the laser-sintered samples. (b) Remnant polar-ization (Pr) and coercive field (Ec) as a function of the Ca concentration.

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Writers: SILVA, R. S.; JESUS, L. M.; OLIVEIRA, T. C.; SAMPAIO, D. V.; SANTOS, J. C. A.; HERNANDES, Antônio Carlos.

Keywords: Barium calcium titanate; Ferroelectric; Laser sintering; Translucent ceramics; Electro-optical devices

Abstract: Multifunctional transparent ferroelectric ceramics can be used in a wide range of applications, suchas optical modulation and image memory devices, optical shutters, switchers, etc. Frequently, electro-optical ceramics are lead-based and have the disadvantages of being harmful to the environment. Forthis reason, continuous effort has been done in the research for lead-free optical transparent ferroelectricceramics. In this work, we have successfully sintered bulk lead-free translucent and nanostructuredBa1−xCaxTiO3(X = 0–0.30) ceramics by the laser sintering technique. In this technique, a CO2laser is usedas the main heating source for sintering. The laser-sintered ceramics presented high relative density,suitable ferro- and dielectric properties, transmittance up to 42% at 950 nm for Ba0.70Ca0.30TiO3sampleand average grain size changing from 420 nm to 600 nm when the Ca concentration increases.

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.