Características estruturais, microestruturais, dielétricas e piroelétricas de cerâmicas de Sr xBa1-X Nb2O6 forjadas a quente

AUTOR(ES)

Venet, Michel, Vendramini, Aline, Santos, Ivair Aparecido, Eiras, José Antonio, Garcia, Ducinei

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2003-12

RESUMO

The texturing process and the characterization of textured Sr xBa1-xNb2O6 (x = 0.5; x = 0.6) ferroelectric ceramics were investigated. The ceramic bodies were fabricated through two stage sintering. The first and second stage consisted in conventional firing and hot forging of the ceramic bodies, respectively, both at oxygen atmosphere. The forged ceramics achieved high densification level although showing abnormal grain growth. X-ray diffraction, dielectric and pyroelectric analysis showed that is possible to obtain preferential orientation of the [00l] crystallographic planes due to grain arrangement during hot forging. Consequently, the investigated properties for this textured material were strongly dependent on the measurement direction. On the other hand, high room temperature pyroelectric coefficients, of the same order of that obtained for single crystals of same composition, were observed.

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