The effect of 90° domain wall displacements on piezoelectric and dielectric constants of perovskite ferroelectric ceramics
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Ferroelectric ceramics
Domain wall (magnetism)
The influence of domain walls on the macroscopic properties of ferroelectric materials is a well known phenomenon. Commonly, such “extrinsic” contributions to dielectric permittivity are discussed in terms of domain wall displacements under external electric field. In this work, we report on a possible contribution of charged domain walls to low frequency (10–106 Hz) dielectric permittivity in K1-xNaxNbO3 ferroelectric ceramics. It is shown that the effective dielectric response increases with increasing domain wall density. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation. The obtained results may open up possibilities for domain wall engineering in various ferroelectric materials.
Ferroelectric ceramics
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Polyvinylidene fluoride
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Non-blocking I/O
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In this work, 0-3 lead zirconate titanate (PZT) was mixed with normal Portland cement to produce 0-3 connectivity composites. The effect of temperature on the dielectric properties such as the dielectric constant and dielectric loss was determined. It was found that with increasing PZT content the Tc increases where the optimum dielectric constant was observed and that at the temperature up to 100°C there is a significant change in the dielectric properties in PZT-cement composites. This is due to the loss of water molecules at up to 100°C. At above 100°C, the dielectric properties of the composites were found to have a similar behavior to that of PZT ceramic with Tc being ≈420°C.
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Piezoelectric materials, which can convert energy between electrical and mechanical forms, are widely used in modern industry. (K,Na)NbO3-based ceramics have attracted extensive attention due to their excellent performance characteristics among the lead-free materials. Piezoelectric properties are closely related to ferroelectric domain structures including the domain morphology and domain wall motion. However, time dependence of ferroelectric domains in (K,Na)NbO3-based ceramics has barely been studied. Here, we synthesized Li-doped KNN ceramics. The morphologies and crystallographic parameters of the domain structures were characterized. Two ferroelectric domains, the 60°/120° and 180° domains, were identified in the ceramic. Surprisingly, the domain structure changed naturally as time passed, and most of the change occurred in the 180° domain wall, while the 60°/120° domains remained nearly unchanged. Our results are different from those of previous studies, which showed that the non-180° domain wall was more prone to movement than the 180° domain wall.
Domain wall (magnetism)
Potassium niobate
Ferroelectric ceramics
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La2Ti2-xTaxO7(x=0.0,0.1,0.2,0.3) ceramic were prepared by conventional solid state reaction method.The crystal structure,surface morphology,ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics have been investigated.The experimental results indicate that the substitution of Ta5+ for Ti4+ at B site to form La2Ti2-xTaxO7 solid solution can significantly enhance the ferroelectric and dielectric properties of La2Ti2O7 ceramics.At x=0.2%,ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics reach the maximum values(Pr=0.3 μC/cm2,er=5 600).Dielectric properties of La2Ti2-xTaxO7 ceramics are stable in the high-frequency.
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0.55Pb(Ni1/3Nb2/3)O3-0.45Pb(Zr0.3Ti0.7)O3 (0.55PNN-0.45PZT) piezoelectric ceramics are high-performance piezoelectric materials,which are widely used to fabricate the fibers with Pt core and other electronic devices.In order to improve the electrical properties of the piezoelectric ceramic fibers,the 0.55PNN-0.45PZT ceramics with high electrical properties were fabricated by the traditional sintering method in this study.The effects of sintering temperature on the phase structure,microstructure and electrical properties of material have been investigated.High electrical properties ceramic were fabricated by optimizing the sintering temperature.The highest piezoelectric properties were achieved when the ceramics were sintered at 1200℃,and their values were ρ=8.12g/cm3,d33=850pC/N,kp=0.62,er=7317,tanδ=0.033,and Qm=41.66.
Piezoelectric Properties
Lead-free Piezoceramics
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BSTO/Mg2Si04/MgO ceramic composites were fabricated by conventional ceramic processing. The microstructures and dielectric properties of the samples were measured and investigated systemically. The effects of the doping of Mg2SiO4/MgO on the microstructures and dielectric properties of BSTO/Mg2Si04/MgO ceramic composites were investigated. The results show that compared with the other BSTO ceramic composites, BSTO/Mg2SiO4/MgO ceramic composites not only can be sintered at a lower temperature but also keep a higher tunability while the dielectric constant decreases. The typical composition of BSTO/39wt/% Mg2SiO4/17wt% MgO has a dielectric constant of ~80.21, a dielectric loss of -0.003 and a tunability of ~12% under applying 2kV/mm dc bias field.
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The domain wall contributions to the piezoelectric and dielectric properties of ferroelectric materials are discussed in the framework of the Preisach approach. Several examples of the nonlinear behavior in ferroelectric ceramics, thick and highly oriented thin films are discussed.
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Piezoelectric lead zirconate titanate (PZT) ceramic-cement composites using a high volume of ceramic content (80%) in 0–3 connectivity were fabricated. Piezoelectric Force Microscope (PFM) characterization was carried out and ferroelectric hysteresis behavior of the composites were investigated. Domain configurations of PZT ceramic can be seen at the interfacial zone of PZT-cement composites. Ceramic particles were seen to bind well with the cement matrix. The ferroelectric hysteresis loop at 50 Hz and 10–25 kV/cm showed a slim loop with low loss behavior for this type of composite due to increase in the PZT ceramic in 0-3 PZT-cement composites.
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