Open AccessInfluence of the PbO-excess on the structural, microstructural and ferroelectric properties of PLZT ceramics
Author(s) -
A.C. Silva,
Y. Méndez-González,
E. C. Lima,
J. D. S. Guerra
Publication year - 2021
Publication title -
materials and devices
Language(s) - English
Resource type - Journals
ISSN - 2495-3911
DOI - 10.23647/ca.md20201806
Subject(s) - materials science , ferroelectricity , raman spectroscopy , ceramic , lead zirconate titanate , perovskite (structure) , trigonal crystal system , lanthanum , mineralogy , phase (matter) , piezoelectricity , analytical chemistry (journal) , crystal structure , dielectric , crystallography , composite material , inorganic chemistry , optics , chemistry , physics , optoelectronics , organic chemistry , chromatography
The physical properties of lead lanthanum zirconate titanate (PLZT) ceramics have been investigated as a function of a PbO excess from 0 to 20 mol% in samples of Pb0.94La0.06(Zr0.6895Ti0.2955)O3 (composition that reveals the best performance for piezoelectric applications for materials with rhombohedral symmetry). Results are presented in a compressive way in the frame of an overview on PLZT. Structural, microstructural and ferroelectric properties were investigated as a function of the PbO content. The X-ray diffraction results confirmed the formation of the perovskite structure for all the cases. However, the presence of the Pb2O3 secondary phase has been observed for the sample containing 15 mol% PbO excess. Raman spectroscopy studies revealed a strong influence of the PbO content on the active modes shifts. The ferroelectric properties have shown a decrease of both remnant (PR) and saturation (PS) polarizations for compositions up to 10 mol% PbO, whereas an increase of PR and PS was observed for the higher PbO content samples. Results reveal the effect of the PbO excess on the long-range order interactions for the studied system.