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Effect of acceptor and donor dopants on ferroelectric and piezoelectric properties of lead zirconate titanate ceramics
Author(s) -
Ramam Koduri,
Lopez Marta
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622417
Subject(s) - materials science , ferroelectricity , dielectric , lead zirconate titanate , coercivity , tetragonal crystal system , piezoelectricity , analytical chemistry (journal) , piezoelectric coefficient , acceptor , mineralogy , titanate , ceramic , crystallography , crystal structure , condensed matter physics , composite material , chemistry , optoelectronics , physics , chromatography
Dielectric, ferroelectric and piezoelectric properties of Pb 1− x La x (Zr y Ti 1− y ) 1−( x /4)−(3/4) z Fe z O 3 ceramics for z = 0 to 6 mol% prepared by a mixed oxide method were investigated. Fe substitution in lead lanthanum zirconate titanate (PLZT) compositions resulted in a phase transformation from coexisting phases (ferroelectric rhombohedral (FE RH ) and ferroelectric tetragonal (FE TET )) to intensified tetragonal phase. Grain size and apparent density increased with increasing acceptor (Fe) content up to 3 mol% in the PLZT system. The optimum dielectric properties ( ϵ RT , ϵ Tc and tan δ ) were observed in 3 mol% Fe‐doped PLZT composition and then decreased thereafter. Acceptor (Fe) substitution in the PLZT system influenced the ferroelectric remanent polarization ( P r ) and spontaneous ( P s ) polarization, reaching saturation at 6 mol% Fe, while the coercive field ( E c ) increased up to 3 mol% Fe‐doped PLZT composition. The piezoelectric properties are sensitive to acceptor (Fe) modification in the PLZT system which was proved by the decreasing trend of piezoelectric charge coefficient ( d 33 ) up to 3 mol% Fe and then increasing to 6 mol% Fe while the piezoelectric planar coupling coefficient ( k p ) showed a continuous decreasing trend throughout the series. Dielectric, ferroelectric and piezoelectric properties were characterized as a function of acceptor (Fe) concentration in the PLZT system for possible sensor and actuator applications. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)