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Effect of Composition on the Electromechanical Properties of (1‐x)Pb(Mg 1/3 Nb 2/3 )O 3−X PbTiO 3 Ceramics
Author(s) -
Kelly Joe,
Leonard Mark,
Tantigate Chutima,
Safari Ahmad
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02927.x
Subject(s) - electrostriction , dielectric , materials science , phase boundary , electromechanical coupling coefficient , columbite , analytical chemistry (journal) , ceramic , titanate , piezoelectricity , mineralogy , lead titanate , perovskite (structure) , phase (matter) , ferroelectricity , crystallography , composite material , chemistry , optoelectronics , organic chemistry , chromatography
Ceramic lead magnesium niobate–lead titanate ((1‐x)PMN ‐x PT) of different compositions has been prepared by the columbite precursor method. This study discusses compositions ranging from 0.94PMN–0.06PT to 0.60PM–N0.40PT, focusing on two areas of the (1‐x)PMN x PT system: compositions that exhibit electrostrictive behavior, and those that show piezoelectric behavior. In electrostrictive compositions where x is in the range of 0.06–0.20, the dielectric constant and electromechanical coupling factor dependencies on the bias field are evaluated. The optimal electromechanical properties are obtained with the composition 0.82PMN–0.18PT, measured at temperature T = T m (the temperature of maximum dielectric constant) = 80°C and with a dc bias of 5 kV/cm. X–ray diffractometry is used to show that the (1‐x)PMN ‐x PT system has a compositionally wide two–phase region and that 0.655PMN–0.345PT is the morphotropic phase boundary (MPB) composition. Electromechanical property evaluation shows that the optimal piezoelectric properties (piezoelectric charge coefficient ( d 33 ) value of 720 pC/N, dielectric constant ( K ) value of 5400, and electromechanical planar and thickness coupling coefficient ( k p and k t , respectively) values of 62% and 46%, respectively) are obtained at the MPB composition.