Effects of the Addition of Ions Barium on the Structural and Electrical Properties of PZT Ceramic (original) (raw)
Related papers
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.
Integrated Ferroelectrics, 2010
The polycrystalline samples of (Pb 0.90 Ba 0.10) [(Zn 1/3 Nb 2/3) 0.20-(Zr 0.51 Ti 0.49) 0.80 ]O 3 [PBZN-PZT] compositions ceramics have been synthesized by substitution of barium in PZN-PZT by precipitation method and finally by modified columbite method. Xray diffraction (XRD) analysis of (Pb 0.90 Ba 0.10)(Zn 1/3 Nb 2/3)O 3 (PBZN) and PBZN-PZT shows a cubic and mixed phase of tetragonal and rhombohedral pure perovskite structure at room temperature. The dielectric dispersion of the solid solutions of PBZN-PZT has been studied as a function of temperature for the frequency range from 100 Hz to 1 MHz. The temperature (T) variation of the real components (ε) at different frequencies of the dielectric permittivity shows a broad maximum. The diffuse peaks in permittivity versus temperature confirm the relaxor behaviour of PBZN-PZT. The frequency dependence of maximum temperature (T m) in these compounds with barium substitution is modeled using Vogel-Fulcher relation.
Influence of Calcium Concentration on the Structural and Electrical Properties of PZT Ceramic
Materials Science Forum, 2014
Lead zirconate titanate, with Zr/Ti ratio of 53/47 was prepared by the polymeric precursor method. The powders were doped with 0, 0.2, 0.4 end 0.6 mol% of Ca 2+ and characterized by XRD. The percentages of tetragonal and rhombohedral phases were calculated through Rietveld refinement. A systematic study of the effect of dopant on the ferroelectric and piezoelectric properties of PZT was carried out. The remanent polarization, planar coupling factor and piezoelectric charge constant, increase with dopant concentration.
A role of BNLT compound addition on structure and properties of PZT ceramics
Solid State Sciences, 2010
In this research, effects of lead-free bismuth sodium lanthanum titanate (BNLT) addition on structure and properties of lead zirconate titanate (PZT) ceramics were investigated. PZT ceramics with addition of 0.1 e3.0 wt%BNLT were fabricated by a solid-state mixed oxide method and sintering at 1050e1200 C for 2 h to obtain dense ceramics with at least 96% of theoretical density. X-ray diffraction indicated that complete solid solution occurred for all compositions. Phase identification showed both tetragonal and rhombohedral perovskite structure of PZT with no BNLT phase detected. Scanning electron micrographs of fractured PZT/BNLT ceramics showed equiaxed grain shape with both transgranular and intergranular fracture modes. Addition of BNLT was also found to reduce densification and effectively limited grain growth of PZT ceramic. Optimum Hv and K IC values were found to be 4.85 GPa and 1.56 MPa.m 1/2 for PZT/ 0.5 wt%BNLT sample. Among PZT/BNLT samples, room temperature dielectric constant seemed to be improved with increasing BNLT content. The maximum piezoelectric coefficient values were observed in pure PZT ceramic and were slightly decreased in BNLT-added samples. Small reduction of remanent polarization and coercive field in hysteresis loops was observed in BNLT-added samples, indicating a slightly suppressed ferroelectric interaction in this material system.
Effects BNT compound incorporated on structure and electrical properties of PZT ceramic
Current Applied Physics, 2011
Ferroelectric ceramics with formula Pb(Zr 0.52 Ti 0.48 )O 3 /x(Bi 0.5 Na 0.5 )TiO 3 (when x ¼ 0, 0.1, 0.5, 1.0 and 3.0 wt%) were prepared by a solid-state mixed-oxide method and sintered at the temperature between 1050 and 1200 C for 2 h to obtain dense ceramics. It was found that the optimum sintering temperature was 1200 C at which all the samples had relative density at least 96% of their theoretical values. Phase analysis using X-ray diffraction showed tetragonal and rhombohedral perovskite structure of PZT with no BNT peak detected, indicating that completed solid solutions occurred for all compositions. Scanning electron micrographs of fractured PZT/BNT ceramics showed equiaxed grain shape with mixed-mode of transgranular and intergranular fractures. Addition of BNT significantly decreased grain size of the PZT ceramic. Measurement of room temperature dielectric constant indicated a gradual increase with increasing BNT content. Results of ferroelectric characterization showed a slight decrease of remanent polarization and coercive field for BNT-added samples, suggesting ceramics which could be easily poled. Good piezoelectric coefficient (d 33 ) could be maintained and comparable to that of pure PZT ceramic for the sample with 1.0 wt% BNT addition.
Scienceasia, 2020
The effects of sintering condition on phase evolution, physical, microstructure and dielectric properties of the PZT-3BLNT ceramics were investigated. The samples were prepared by a conventional mixed oxide method and sintered at the temperatures ranging from 1050-1200°C under normal atmosphere for 2 h dwell time with a heating/cooling rate of 5°C/min. X-ray diffraction indicated that the mixed rhombohedral-tetragonal phases were observed at lower sintering temperature of 1050°C, while the tetragonal phase became dominant at higher sintering temperature (1200°C). The optimum sintering temperature for preparation of high-density PZT-3BLNT ceramic was found to be 1200°C. Linear shrinkage and average grain size tended to increase with increasing the sintering temperature. The effects of annealing conditions on mechanical and dielectric properties of the PZT-3BLNT ceramic sintered at 1200°C were also studied in this work. It was found that the maximum room temperature dielectric constant (r) of 1313 and Vickers hardness (H V) of 4.38 GPa were achieved for the sample annealed at 950°C for 8 h dwell time and this value was ∼18-20% higher than that of the unannealed sample. This result was also well correlated with the maximum relative density observed for this annealing condition.
Technology and Properties of PBZTS Ceramics
… Journal of Applied …, 2011
This paper presents the results of preparing and investigating the solid solution of lead barium zirconate titanate stannate (Pb 1Àx Ba x )[(Zr 1Ày Ti y ) 1Àz Sn z ]O 3 with x = 0.25, y = 0.35 and z = 0.00, 0.02, 0.04, 0.08, 0.10. Ceramic samples were obtained from oxides and carbonates using conventional ceramic technology and pressureless sintering. The results of Energydispersive X-ray spectroscopy (EDS) investigations, XRD studies, as well as dielectric measurements and electromechanical investigations are presented. It was stated that at the room temperature, the structure of the investigated samples is pseudocubic, typical for relaxors. Maximal value of elementary cell parameter is observed for z = 0.02, and for higher values of z, we observe almost linear decrease with increasing z. It was found that with increasing content of the Sn, the temperature T m at which dielectric permittivity reaches its maximum decreases. Analyzing P-E hysteresis loops it was stated that the phase transition in the investigated samples takes place at temperatures approximately 100°C lower than the temperature of the dielectric permittivity maximum. The temperature of phase transition was calculated also from hysteresis loops and compared with that obtained from measurements of dielectric permittivity. *ryszard.skulski@us.edu.pl
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