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

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 electro...

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Bibliographic Details
Published in:physica status solidi (b) 2013-08, Vol.250 (8), p.1551-1555
Main Authors: González-Abreu, Y., Peláiz-Barranco, A., Guerra, J. D. S., Saint-Grégoire, P.
Format: Article
Language:English
Subjects:
Aurivillius compounds
ceramics
Condensed Matter
ferroelectrics
Materials Science
Physics
piezoelectricity
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Summary: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.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.201248413