Dielectric properties of the multicomponent PZT-type solid solution (original) (raw)
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Applied Physics A, 2018
In this work, the multicomponent Pb(Zr 0.58 Ti 0.42)O 3 ceramics doped by calcium (Ca), sodium (Na), bismuth (Bi) and cadmium (Cd) was designed and obtained by the hot uniaxial pressing method. Comprehensive electrophysical properties including crystalline structure, microstructure, dielectric, electromechanical and piezoelectric of the ceramics were made. The Pb 0.92 Ca 0.02 Na 0.01 Bi 0.05 (Zr 0.58 Ti 0.42) 0.98 Cd 0.02 O 3 ceramics obtained by the hot uniaxial pressing method has a microstructure of a regularly crystallized grain. The multicomponent material shows high values of dielectric and piezoelectric properties with high ferroelectric hardness. A wide and rectangular hysteresis loop of the PZT-type ceramics shows high ferroelectric hardness of obtained ceramics. Studies have also shown that multicomponent PZT-type ceramics exhibits a strong S-E behavior. The S-E electromechanical loops have characteristic "butterfly wings" shape with high values of mechanical strain. These properties of the obtained material allow its application in the modern microelectronics and micromechatronics, for example, in constructing electromechanical and electroacoustic transducers, piezotransformators, piezoelectric motors, etc.
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1989
Absfruct-Pure (undoped) piezoelectric lead zirconate titanate (PZT) ceramic samples at compositions across the ferroelectric region of the phase diagram have been prepared from sol-gel derived fine powders. Excess lead oxide was included in the PZT powders to obtain dense (95-96 percent of theoretical density) ceramics with large grain size (> 7 pm), and to control the lead stoichiometry. The dielectric, piezoelectric, and elastic properties were measured from 4.2-300" K. At very low temperatures, the extrinsic domain wall and thermal defect motions "freeze out." The low temperature dielectric data will be used to determine coefficients in a phenomenological theory. The extrinsic contribution to the properties can then be separated from the single domain properties derived from the theory.
Structural and Dielectric Properties of PZT Ceramics Prepared by Solid-State Reaction Route
Polycrystalline Pb (Zr1-xTix)O3 with x = 0.50 abbreviated as PZT has been prepared by high energy solid-state reaction technique. Analysis of XRD patterns of this composition suggests the formation of PZT phase with tetragonal structure. SEM st udies were used for microstructural characterization. The dielectric properties of PZT ceramics have been characterized. The measurements have been made in frequency ranging from 100 Hz to 1 MHz and between room temperature (RT) and 550ºC for low and high frequencies. At RT, the value of dielectric constant (εr) is 515.492 at 1 KHz whereas the loss tangent is 0.005. From εr (T) measurements, the Curie temperature of our sample has been determined at 380ºC. The increase of εr observed at high temperatures and low frequencies in the paraelectric state are explained, this abnormal behavior is due to the migration of oxygen ions towards the electrodes.
Materials Sciences and Applications, 2013
The structural and electrical properties of Pb[Zr x Ti 0.95−x (Mo 1/3 In 2/3) 0.05 ]O 3 piezoelectric ceramics system with the composition near the morphotropic phase boundary were investigated as a function of the Zr/Ti ratio. Studies were performed on the samples prepared by the conventional method of thermal synthesis of mixed oxides. The materials structure was investigated by X-ray diffractometry to demonstrate the coexistence of the tetragonal and rhombohedral phases. In the present system, the MPB, in which the tetragonal and rhombohedral phases coexist, is in a composition range of 0.47 ≤ x ≤ 0.50. The lattice constants of the a and c axes for the samples were calculated from the XRD patterns. Microstructure of the sintered ceramics was observed by scanning electron microscopy (SEM) of free surfaces specimens. The relative permittivity, dielectric dissipation, piezoelectric coefficient and electromechanical coupling factor reach at maximum value x = 0.49 (ε r = 7300.345 (at the Curie temperature), tanδ = 0.002050, d 31 = 94.965 PC/N and k p = 0.513 and a Curie temperature of 430˚C). These properties are very promising for applications in ultrasonic motors.
Structural and dielectric properties of (La, Bi) modified PZT ceramics
Solid State Communications, 2004
Polycrystalline samples of Pb0.9(La 12z Bi z )0.1(Zr0.55Ti0.45)0.975O 3 [referred as PLBZT] (z = 0 : 0 ; 0.3, 0.5 and 0.7) have been synthesized by a high-temperature solid-state reaction technique. X-ray diffraction analysis suggests the formation of singlephase compounds with monoclinic structure. The dielectric studies of the compounds as a function of temperature (room temperature, RT to 350 8C) at frequency (1, 10 and 100 kHz) show that the compounds undergo a phase transition of diffuse type. Diffusivity ðgÞ study of phase transition of these compounds provided its value between 1 and 2, indicating the variation of degree of disordering in the system. Measurement of dc resistivity ðrÞ as a function of temperature (RT to 350 8C) at a constant biasing field suggests the compounds have negative temperature coefficient of resistance.
Dielectric and piezoelectric properties of PZT ceramics doped with strontium and lanthanum
Ceramics International, 2011
PZT based piezoelectric ceramics obtained by doping with various levels of Sr2+ and La3+, designated as PSLZT, were prepared by conventional processing techniques. The effects of Sr2+ and La3+ additions, and that of the Zr/Ti ratio on microstructure, on phase constitution, and on the dielectric and piezoelectric properties were investigated. XRD data revealed that all PSLZT compositions had perovskite structure in which increasing Sr and/or decreasing Zr/Ti ratio increased the tetragonality. In PSLZT ceramics the morphotropic phase boundary (MPB) appeared as regions extending from Zr/Ti ratio of 52/48 to 58/42. Among all compositions studied, the PSLZT ceramic having 5 at% Sr2+ and 1 at% La3+ with a Zr/Ti ratio of 54/46 exhibited a peak piezoelectric strain coefficient of d33 = 640 pC/N with attending dielectric and electromechanical parameters KT = 1800, kp = 0.56, Qm = 70, and tan = 1.55%.
Ceramics International, 2012
This paper investigated the low-frequency mechanical properties of ferroelectric ceramics (PZT-5H and PZT-8) and anti-ferroelectric ceramics ((Pb 0.97Àx Ba x La 0.02 )(Zr 0.50 Ti 0.10 Sn 0.40 )O 3 , x = 0.08, 0.09, 0.10, 0.11) by a dynamic mechanical analyzer (DMA). The dynamic mechanical analysis was performed from À100 to 400 8C in temperature and 0.1-4 Hz in frequency. The dielectric properties were also measured as a comparison. The results showed an obvious turning point (T m ) where tan d reached its maximum and the modulus began to increase for all the samples. tan d revealed an relaxation region in the ferroelectric ceramics and no corresponding region in the anti-ferroelectric ceramics, which may be originated from the domain walls' motion in the ceramic. The tan d started to decrease to nearly zero around the tetragonal to cubic phase transition temperature (T c ) for all of the tested samples. #
Advances in Applied Ceramics, 2019
Lead-free piezoelectric ceramic (Ba 0.85 Ca 0.15)(Zr 0.1 Ti 0.9)O 3 (BCZT) has been synthesised by solid-state sintering method and the effect of grain size on ferroelectric, piezoelectric, dielectric, mechanical and piezo-electro-mechanical properties was systematically studied. The compacted powders were sintered at three temperatures i.e. 1450°°C, 1500°C and 1550°C for an optimised duration of 5 h and they have exhibited well resolved morphotropic phase boundary with an average grain size ranging from 10 to 25 µm. Enhanced piezoelectric charge, d 33 ∼ 560 pC/N and voltage, g 33 ∼ 14.3 mV m/N coefficients were obtained for the 1450°C sintered BCZT sample. A maximum strain of around ∼0.14% was obtained which is comparable to that of lead-based piezoelectrics. Variation of relative permittivity with temperature revealed that the curves are independent of frequency, indicating the typical relaxor ferroelectric nature of the samples. A systematic study on cyclic loading was performed to evaluate piezo-electro-mechanical coefficients at different loads which showed hysteresis behaviour. High value of elastic modulus (E) and hardness (H) i.e. 262.7 ± 38.1 GPa and 13.7 ± 1.7 GPa were exhibited by samples sintered at 1450°C, which is higher than that of BCZT synthesised by wet-chemical methods. The results are discussed.