Influência da matriz cer mica nas propriedades de compósitos ferroelétricos à base de poli (fluoreto e vinilideno)

Abstract

Ferroelectric Composites were synthesized with the aim of combining the piezo, pyro and ferroelectric properties of Lanthanum modified Lead Zirconate Titantate (PLZT) ceramics with the mechanical and electrical properties of Poly Vinylidene(Fluoride) (PVDF) polymer. It was employed in the synthesis of these samples both variation in the stoichiometry of the ceramic matrix, using PLZT (5/65/35) (9/65/35) and (11/65/35) with the mass ratio / mass 0,75PLZT / 0,25PVDF, as a variation of the ratio weight / weight of (x)PLZT (9/65/35)/(1-x)PVDF, x equal to 5, 10, 15, 20, 25, 50 and 75% . The study was based on influences of these variations in the electrical and structural properties of the composites. From the structural point of view, it was observed that the polymeric part of the composite have polar phase concentration (β phase), ferroelectric, in the order of 93%, as well as the presence of an amorphous phase, independent of concentration and stoichiometry of PLZT. Already under the electrical point of view, it was clear that the stoichiometry difference changes significantly the resistivity values, dielectric constant and polarizations in composites.