Microstructural Features and Functional Properties of Bilayered BaTiO3/BaTi1-xZrxO3 Ceramics

Microstructural Features and Functional Properties of Bilayered BaTiO3/BaTi1-xZrxO3 Ceramics

Author Amaral, Thiago Martins Google Scholar
Antonelli, Eduardo Autor UNIFESP Google Scholar
Alejandro Ochoa, Diego Google Scholar
Eduardo Garcia, Jose Google Scholar
Hernandes, Antonio Carlos Google Scholar
Institution Universidade de São Paulo (USP)
Univ Politecn Cataluna
Universidade Federal de São Paulo (UNIFESP)
Abstract Validity of mixture rule for dielectrics in series configuration and the correlation between microstructure and electrical properties in bilayered BaTiO3/BaTi1-xZrxO3 ceramics were studied. Samples were obtained from BaTi1-xZrxO3 (BTZx) nanopowder synthesized by the polymeric precursor technique and had their microstructure, dielectric, piezoelectric, and ferroelectric properties investigated. These bilayered ceramics' properties were compared to the properties of homogeneous BTZx samples. And, also, the formers' electrical permittivities were compared with the predictions of the simple mixture rule. According to the results, the microstructures of the layers do not differ from the microstructure of the corresponding homogeneous BTZx ceramic. and pyroelectric coefficient measurements show that the electrical properties of the interface do not contribute to the functional properties of the bilayered samples. Nevertheless, on increasing Zr4+, the agreement between the experimental and the predicted permittivity of the bilayered ceramics is gradually reduced, mainly at temperatures where the permittivity is governed by the response of the layer containing Zr4+. As a mechanical joint between the layers, the interface induces stresses during sintering due to thermal mismatch between compositions, thereby affecting the bilayers' electrical properties. Our results show that interface's mechanical effects compromise the functional properties of layered ferroelectric ceramics.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Spanish Government
Grant number Spanish Government: MAT2013-48009-C4-2-P
Date 2015-04-01
Published in Journal of the American Ceramic Society. Hoboken: Wiley-Blackwell, v. 98, n. 4, p. 1169-1174, 2015.
ISSN 0002-7820 (Sherpa/Romeo, impact factor)
Publisher Wiley-Blackwell
Extent 1169-1174
Origin http://dx.doi.org/10.1111/jace.13417
Access rights Closed access
Type Article
Web of Science ID WOS:000352635100022
URI http://repositorio.unifesp.br/handle/11600/38976

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