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Lanthanum‐Modified (1 – x)(Bi 0.8 La 0.2 )(Ga 0.05 Fe 0.95 )O 3 ·xPbTiO 3 Crystalline Solutions: Novel Morphotropic Phase‐Boundary Lead‐Reduced Piezoelectrics
Author(s) -
Cheng JinRong,
Eitel Richard,
Cross L. Eric
Publication year - 2003
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.1151-2916.2003.tb03617.x
Subject(s) - curie temperature , materials science , phase boundary , dielectric , lanthanum , tetragonal crystal system , coercivity , analytical chemistry (journal) , piezoelectricity , perovskite (structure) , mineralogy , dissipation factor , phase (matter) , crystallography , crystal structure , condensed matter physics , inorganic chemistry , chemistry , composite material , ferromagnetism , physics , optoelectronics , organic chemistry , chromatography
(1 – x )(Bi 0.8 La 0.2 )(Ga 0.05 Fe 0.95 )O 3 · x PbTiO 3 (BLGF‐PT) crystalline solutions have been fabricated by solid‐state reactions. BLGF‐PT has single perovskite phase structure with a rhombohedral–tetragonal (FE r ‐FE t ) morphotropic phase boundary (MPB) at a PT content of x = 0.43. Lanthanum substitution has been found to increase the insulation resistance and decrease the coercive field down to 20 kV/cm, which results in significant improvements in dielectric and piezoelectric properties of BLGF‐PT. The dielectric constant, loss tangent, Curie temperature, remnant polarization, piezoelectric d 33 constant, and planar coupling factor of 1760, 0.05, 264°C, 33 μC/cm 2 , 295 pC/N, and 0.36, respectively, have been achieved for BLFG‐PT in the vicinity of the MPB. Compared with conventional Pb(Zr,Ti)O 3 (PZT) piezoelectric ceramics, the BLGF‐PT is a competitive alternative piezoelectric material with decreased lead content.