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Coexistence of Relaxor and Normal Ferroelectric Phases in Morphotropic Phase Boundary Compositions of Lanthanum‐Modified Lead Zirconate Titanate
Author(s) -
Gupta Surya M.,
Li JieFang,
Viehland Dwight
Publication year - 1998
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.1151-2916.1998.tb02374.x
Subject(s) - materials science , phase boundary , ferroelectricity , lead zirconate titanate , tetragonal crystal system , dielectric , lanthanum , relaxor ferroelectric , phase (matter) , atmospheric temperature range , curie temperature , titanate , condensed matter physics , mineralogy , analytical chemistry (journal) , composite material , thermodynamics , ceramic , ferromagnetism , chemistry , inorganic chemistry , physics , optoelectronics , organic chemistry , chromatography
Hot‐stage transmission electron microscopy studies of lanthanum‐modified lead zirconate titanate (Pb 1‐ x La x ‐(Zr 0.53 Ti 0.47 ) 1‐ x /4 O 3 (PLZT 100 x /53/47) have been performed for compositions close to the morphotropic phase boundary (MPB). These studies have revealed the coexistence of relaxor and normal ferroelectric phases. Lanthanum substitution disrupts long‐range ferroelectric order, resulting in short‐range polar ordering. Investigations also have been performed using dielectric spectroscopy, electrically induced polarization, and strain methods. Three phases have been found for 10/53/47: a low‐temperature tetragonal phase, a high‐temperature cubic phase, and an intermediate‐temperature pseudocubic phase that exhibits relaxor ferroelectric behavior. Induced strain studies of 10/53/47 show a gradual change from butterfly‐shaped to slim‐quadratic loops with increasing temperature. In addition, the remanent strain decreases with increasing temperature, and reversible strain shows a peak at 80°C that corresponds to the appearance of intermediate phase.