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Artigo Científico | Propriedades Físicas dos Cerâmicos | Inglês | 25/07/2003
Autores: Aline Vendramini, D. Garcia, I.A. Santos, J.A. Eiras, Michel Venet
Palavras-chave: ferroelectric ceramics, forging, hot pressed, texturing
Resumo: The texturing process and the characterization of textured SrxBa1-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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