Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties

Ceramics International, Amsterdam, v. 42, n. 7, p. 8488-8494

12 de fevereiro de 2016 CDMF Artigo, Meio Ambiente 0

SEM-micrograph — Fig: SEM micrographofbilayeredBaTiO3/BaTi0.8Zr0.2O3 ceramics sinteredfor(a)2h,(b)4h,(c)8hand(d)16h.Thecomposition,volumetricfraction(α) andinterface thickness ofeachlayeraredisplayed.Zirconiumconcentrationprofiles asafunctionofthelongitudinallengtharealsopresentedinthemicrographs.

Writers: AMARAL, Thiago Martins; ANTONELLI, Eduardo; OCHOA, Diego Alejandro; GARCÍA, José Eduardo; HERNANDES, Antônio Carlos

Keywords: A. Sintering; Barium titanate; Layered ceramics; Dielectric; Ferroelectric and piezoelectric properties

Abstract: The dielectric, pyroelectric and ferroelectric properties of bilayered BaTiO₃/BaTi_0.8Zr_0.2O₃ ceramics are described and correlated with their microstructure. Different sintering times are employed to change the microstructure and promote interdiffusion between the layers. The effects of constrained sintering on both compositions are analyzed and their properties are compared to that of single phase BaTiO₃ and BaTi_0.8Zr_0.2O₃ ceramics. The results show that, at sintering times until 2 h, the bilayer properties are predominantly affected by the presence of residual stresses. Only after 4 h sintering, the properties are predominantly affected by interdiffusion between the layers.

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