Structural and electrical characteristics of rhombohedral lead zirconate titanate single crystals
authors Perez, JA; Soares, MR; Paz, FAA; Klinowski, J; Senos, AMR; Mantas, PQ
nationality International
journal JOURNAL OF MATERIALS SCIENCE
keywords SOLID-SOLUTION SYSTEM; THERMODYNAMIC THEORY; PHASE-TRANSITIONS; DIELECTRIC-PROPERTIES; NEUTRON-DIFFRACTION; THIN-FILMS; PBZR1-XTIXO3 CRYSTALS; GROWTH; TEMPERATURES; CERAMICS
abstract Two PbZrxTi1-xO3 (PZT) single crystals, from a batch prepared by the flux method, were analysed to assess their chemical composition. The two single crystals were found by electron microprobe analysis to have the chemical compositions PbZr0.60Ti0.40O3 and PbZr0.65 Ti0.35O3. X-ray diffraction at -93 degrees C revealed that both crystals have the R3m space group, which means that the R3m <-> R3c phase transition is not observed in this composition range for temperatures above -93 degrees C. The dielectric permittivity was measured along the [001] direction at several frequencies from 1 kHz to 1 MHz, at varying temperatures up to 460 degrees C, and the parameters of the Curie-Weiss law were determined. The parameters of a thermodynamic model for the rhombohedral phase were determined by fitting the experimental data with the theoretical model. The polarization was calculated as function of the temperature for both crystals and the results were used to observe the order of the phase transition. The polarization increases when the concentration of PZT approaches the morphotropic region from the rhombohedral side. This fact, already observed in ceramic samples, is for the first time reported in single crystals which contributes for the clarification of the maximum of electrical properties in the morphotropic region.
publisher SPRINGER
issn 0022-2461
year published 2015
volume 50
issue 12
beginning page 4232
ending page 4243
digital object identifier (doi) 10.1007/s10853-015-8974-4
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000354089200008
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