Piezoelectric behavior in Sr1 − xBaxBi2Nb2O9 Aurivillius-type structure ferroelectric ceramics

Authors

  • Y. González-Abreu,

    1. Facultad de Física – Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, San Lázaro y L, Vedado, La Habana 10400, Cuba
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  • A. Peláiz-Barranco,

    Corresponding author
    • Facultad de Física – Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, San Lázaro y L, Vedado, La Habana 10400, Cuba
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  • J. D. S. Guerra,

    1. Grupo de Ferroelétricos e Materiais Multifuncionais, Instituto de Física, Universidade Federal de Uberlândia, 38400-902 Uberlândia – MG, Brazil
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  • P. Saint-Grégoire

    1. Department of Sciences and Arts, University of Nîmes, 30021 Nimes cedex 01, ICGM (UMR CNRS no 5253), C2M, 34095 Montpellier cedex 05, France
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Phone: +537 8790743

Abstract

The paper presents a piezoelectric study, carried out at room temperature, for the Sr1 − xBaxBi2Nb2O9 (x = 0, 15, 30, 50, 70, 85, 100 at%) ferroelectric (FE) ceramic system. The structural analysis has shown, for all the compositions, a pure orthorhombic phase with space group A21am. A large electromechanical anisotropy phenomenon has been observed between the electromechanical coupling factors for the thickness and the planar vibrations, which could be very interesting for high-frequency array transducers. The best values of piezoelectric parameters have been obtained for the Sr0.70Ba0.30Bi2Nb2O9 composition. Our analysis of the X-ray diffraction patterns around the (200) and (020) planes, before and after the polarization process, has suggested a better polarization process for barium concentrations of 15 and 30 at%, which provides higher piezoelectric properties.

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