Dielectric Properties of Modified Lead Zirconate Titanate (original) (raw)
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Dielectric properties of ceramics in lead zirconate titanate-lead magnesium niobate system
Songklanakarin J Sci Tech, 2004
Yimnirun, R., Ananta, S. and Laoratakul, P. Dielectric properties of ceramics in lead zirconate titanate -lead magnesium niobate system Songklanakarin J. Sci. Technol., 2004, 26(4) : 529-536 In this study, the xPb(Zr 0.52 Ti 0.48 )O 3 -(1-x)Pb(Mg 1/3 Nb 2/3 )O 3 (when x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0) ceramic composites are prepared from PZT and PMN powders by a conventional mixed-oxide method. The dielectric properties of the ceramics are measured as functions of both temperature (-150 -400ºC) and frequency (100 Hz -1 MHz). The results indicate that the dielectric properties of the pure phase PZT and PMN are of normal and relaxor ferroelectric behaviors, respectively. The dielectric behaviors of the 0.9PZT -0.1PMN and 0.7PZT -0.3PMN ceramics are more of normal ferroelectrics, while the other compositions are obviously of relaxor ferroelectrics. In addition, the transition temperature decreases and the maximum dielectric constant increases with increasing PMN content in the system. These results clearly show the significance of PMN in controlling the dielectric behavior of the PZT-PMN system.
Materials Letters, 2005
Ceramic solid solutions within the system (1 À x)Pb(Zr 0.52 Ti 0.48 )O 3 -xBaTiO 3 , where x ranged from 0.0 to 1.0, were prepared by a modified mixed-oxide method. The crystal structure, microstructure and dielectric properties of the ceramics were investigated as a function of composition via X-ray diffraction (XRD), scanning electron microscopy (SEM) and dielectric spectroscopy. While pure BT and PZT ceramics exhibited sharp phase transformation expected for normal ferroelectrics, the (1 À x)PZT -xBT solid solutions showed that with increasing solute concentration (BT or PZT), the phase transformation became more diffuse. This was primarily evidenced by an increased broadness in the dielectric peak, with a maximum peak width occurring at x = 0.4. D
Dielectric properties of lead zirconatetitanate
2020
Ferroelectric lead zirconate titanate (PZT) thin films deposited on metal foil substrates are suitable for developing a wide range of applications. PZT were prepared by mixed oxide method at 1100C. Crystalline nature of the synthesized PZT has been confirmed by X-ray powder diffraction studies. Dielectric measurement shows that decrease in dielectric constant with increase in temperature. The dielectric loss was found to be very small and decreasing with frequency, also above 300°C. The increase of dielectric constant observed at high temperatures and low frequencies in the paraelectric state are explained.
Dielectric and electrical properties of gadolinium-modified lead-zirconate-titanate system
Journal of Alloys and Compounds, 2014
The gadolinium (Gd) modified lead zirconate titanate (PbZr,TiO 3) ceramics with Zr/Ti = 48/52 (i.e., near morphotropic phase boundary (MPB)) in a general chemical formula Pb 1Àx Gd x (Zr 0.48 Ti 0.52) 1Àx/4 O 3 (PGZT; x = 0, 0.07, 0.10 and 0.12) have been synthesized using a high-temperature solid-state reaction method. Preliminary structural analysis using X-ray powder diffraction (XRD) shows the formation of a single-phase tetragonal structure of the compounds. Detailed studies of dielectric parameters of PGZT exhibit the diffuse phase transition but non-relaxor characteristics in the material for the higher concentration of gadolinium. The ac conductivity spectra of PGZT are found to obey Jonscher's universal power law. The electrical impedance parameters of PGZT (near MPB) were obtained in a wide range of temperature (25-500°C) and frequency (1-1000 kHz) using complex impedance spectroscopy (CIS) technique. Detailed analysis of these parameters shows that bulk (grain) and grain boundary resistance have significant effect on the total impedance of the materials. Temperature dependence of hysteresis characteristics of PGZT confirms that the phase transition parameter of the material is strongly affected by the substitution of Gd at the Pb-sites. Ó 2014 Elsevier B.V. All rights reserved. 2. Experimental 2.1. Sample preparation Lead monoxide (99% Loba Chemie Pvt. Ltd., India), titanium dioxide (99.5% Loba Chemie Pvt. Ltd., India), gadolinium trioxide (99.9% Loba Chemie Pvt. Ltd., India) and zirconium oxide (99%, Himedia Chemie Pvt. Ltd., India) were used to synthesize the required materials. The polycrystalline samples of Gd-modified lead zirconate titanate with a general formula Pb 1Àx Gd x (Zr 0.48 Ti 0.52) 1Àx/4 O 3 (PGZT) (x = 0, 0.07, 0.10 and 0.12) were prepared using a high-temperature solid-state reaction technique with the above oxides. Two-mole% of excess PbO was taken to compensate for Pb loss during high-temperature calcination and sintering. The ingredient (oxides) were mixed thoroughly; first in an air atmosphere for 1 h and then in wet (i.e., methanol) atmosphere for 2 h in agate mortar. The calcination temperature of the mixed samples was optimized (1100°C) based on repeated firing/mixing for 4 h
Journal of Materials Science, 2008
Polycrystalline samples of Pb[(1x)(Zr 1/2 Ti 1/2 ) x(Zn 1/3 Ta 2/3 )]O 3 , where x = 0.1-0.5 were prepared by the columbite and wolframite methods. The crystal structure, microstructure, and dielectric properties of the sintered ceramics were investigated as a function of composition via X-ray diffraction (XRD), scanning electron microscopy (SEM), and dielectric spectroscopy. The results indicated that the presence of Pb(Zn 1/3 Ta 2/3 )O 3 (PZnTa) in the solid solution decreased the structural stability of overall perovskite phase. A transition from tetragonal to pseudo-cubic symmetry was observed as the PZnTa content increased and a co-existence of tetragonal and pseudo-cubic phases was observed at a composition close to x = 0.1. Examination of the dielectric spectra indicated that PZT-PZnTa exhibited an extremely high relative permittivity at the MPB composition. The permittivity showed a ferroelectric to paraelectric phase transition at 330°C with a maximum value of 19,600 at 100 Hz at the MPB composition.
2011
We have carried out the powder x-ray diffraction and dielectric studies on multiferroic particulate composite xNi 0.9 Zn 0.1 Fe 2 O 4 /(1-x)PbZr 0.52 Ti 0.48 O 3 with x=0.15, 0.30, 0.45, 0.60, 0.75 and 0.90 to explore the structural and ferroelectric properties. A conventional double sintering method was used to prepare the xNi 0.9 Zn 0.1 Fe 2 O 4 /(1-x)PbZr 0.52 Ti 0.48 O 3 composites. The structure of one of the component Ni 0.9 Zn 0.1 Fe 2 O 4 is spinel cubic with space group , while the other component PbZr 0.52 Ti 0.48 O 3 is selected around the morphotropic phase boundary region in which the tetragonal and monoclinic phases with space group P4mm and Cm coexist respectively. We have carried out Rietveld refinement of the structure to check the formation of ideal composites with separate ferroelectric and ferrite phases. Even though the structural characterization does not reveal the formation of any new phase due to reaction between the two components of the composite during sintering, the tetragonality of the PbZr 0.52 Ti 0.48 O 3 continuously decreases with increasing the ferrite fraction while the lattice parameter of ferrite phase increases with increasing fraction of the ferroelectric phase. Similarly, the dielectric study reveals clear shift in the ferroelectric to paraelectric phase transition temperature of PbZr 0.52 Ti 0.48 O 3 during composite formation suggesting that part of Ni 2+ , Zn 2+ / Fe 3+ ions are diffusing at the B-site of PbZr 0.52 Ti 0.48 O 3 replacing Ti 4+ , which in turn decreases its transition temperature. Scanning electron micrograph of sintered pellet surface confirms the presence of two types of particle morphology in the particulate composite, corresponding to ferrite and ferroelectric phases.
Dielectric characterization of microwave sintered lead zirconate titanate ceramics
Highly reactive lead zirconate titanate powders (PZT) with different compositions were successfully synthesized by the oxidant-peroxo method (OPM) and used to prepare dense ceramic samples with composition near to the morphotropic phase boundary (MPB) sintered at 1000 °C for 2 h using a tubular conventional oven and a commercial microwave system. Crystalline phases were identified in the powder and ceramic samples by X-ray powder diffraction and FT-Raman spectroscopy at room temperature. The fractured surface of the ceramic sample showed a high degree of densification with fairly uniform grain sizes. Dielectric constants measured in the range from 30 to 500 °C at different frequencies (1, 10 and 100 kHz) indicated a normal ferroelectric behavior regardless of the sintering method. Samples sintered by a microwave radiation (MW) method and composition near to the MPB region showed a maximum dielectric constant of 17.911 and an anomalous high Curie temperature of 465 °C.
Structural and Electrical Properties of Lead Zirconate Titanate [Pb(ZrxTi1-x)O3] Ceramics
Lead Zirconate Titanate [PZT: Pb(ZrxTi1-x)O3; x = 0.40, 0.45, 0.55 and 0.60] ceramics were prepared by mixed oxide method at high temperature. Preliminary structural analysis through X-ray diffraction technique suggests about the formation of compounds at room temperature in tetragonal crystal system. Their tetragonality exhibits a decreasing trend with the increase in Zr4+ concentration. Micro structural analysis using SEM-microphotographs suggests that the grains are uniformly distributed on the surfaces of the samples with small porosity. Study of dielectric properties at different temperatures and frequencies exhibits high dielectric constant and low loss tangent along with the transition temperature well above the room temperature. The ferroelectric to paraelectric transition temperature in PZT samples exhibits a decreasing trend with the increase in Zr4+ concentration. Study of ac-conductivity at different temperatures and the value of activation energy in different regions suggest that the conduction process in the materials is of mixed type; singly ionized in ferroelectric region and doubly ionized in paraelectric region.
Physica B: Condensed Matter, 2013
The perovskite Pb (1 À x) Ba x Zr 0.55 Ti 0.45 O 3 material (x ¼0.00, 0.01, 0.02, 0.03, 0.05, and 0.07) was synthesized by solid state reaction route. Green bodies were sintered at 1250 1C. All samples were subjected to X-ray diffraction analysis and they were found to be in single phase. Dielectric properties were studied as a function of temperature and frequency. Ferroelectric properties were studied as a function of temperature. Remnant polarization, saturation polarization and coercive field were determined for all the samples using ferroelectric loops. Piezoelectric properties such as d 33 and electromechanical coupling factor (k p) were also measured at room temperature for all samples.