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2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM)
Gadolinium-doped lead lanthanum zirconate titanate (Pb0.94−xGdxLa0.06)(Zr0.52Ti0.48)O3: PLGZT ceramics with x= 0, 2, 4, 6, and 8% have been successfully fabricated using a sol-gel auto-combustion method. Pure perovskite PLGZT was acquired for the powder calcined at 850 °C for 3h. In addition, the manipulation of Gd3+-substituted PLZT on the microstructure, ferroelectric and mechanical properties was...
We report on the fabrication and characterization of lead zirconate titanate (PZT)-coated cantilever resonators for the realization of piezoelectric nanoelectromechanical systems (NEMS) with integrated actuation and detection capabilities. PZT is deposited by microcontact printing, resulting in a relatively thin PZT film without deterioration of its piezoelectric properties induced by etching damage...
A finite element model is presented in which bilayer lead zirconate titanate (PZT) structures that are formed from a dense layer and a porous layer are investigated for their hydrostatic sensing properties. The model simulates the poling of the porous ferroelectric material to determine the distribution of poled material throughout the structure. The fraction of PZT successfully poled is found to...
In this study, the electrical behavior of CCTO/SiO2 composites have been analyzed. The ceramic composite was made of CaCu3Ti4O12 coated with SiO2 by sol-gel method. The composites were made of SiO2 concentration and sintered in different temperature. The effect of SiO2 concentration and sintering temperature on the microstructure and non-ohmic behavior of composites were investigated. The breakdown...
The relatively low melting point of lead oxide (approx. 900 °C) has always presented an issue in the processing of lead zirconium titanate (PZT) piezoelectric ceramics. The loss of PbO at high sintering temperatures (up to 1300 °C) can cause undesirable changes in stoichiometry, phase composition and electrical properties of the final ceramic product. In high-volume production, the PbO loss per piece...
Ferroelectric capacitors based on thin films such as lead zirconate Titanate(PZT) and strontium bismuth titanate (SBT) have capacitance density and significant spontaneous polarization. DC-DC switching polarization switching converter is presented in this paper with the utilization of ferroelectric capacitor. The topology used in this converter is series and parallel which is analyzed using calculations,...
In this paper, a finite element method and multiphysics based 3D modeling of tunable ferroelectric thin film resonator taking the advantages of electrostrictive and piezoelectric effects of Ba0.8Sr0.2TiO3 thin film. DC electrical field dependency of the dielectric permittivity and elasticity coefficients can control the resonances in the thin film. The resonator has a series resonant frequency of...
Multilayer piezoelectric actuators, typically used in nano-positioning applications under high electrical field excitation, are affected by hysteresis, which limits their applications in terms of open-loop positioning and stability in closed-loop systems. In this paper, a reduced Preisach model superimposed to a linear response is applied. With only 5 parameters, the model shows a good match to experimental...
Ferroelectric ceramics and crystals are the main component of many acoustic transducers based on piezoelectric effect. These materials exhibit different types of losses (dielectric, mechanical or coupled, piezoelectric “losses”) which may have strong effect on the resonances of its impedance.
This paper provides a qualitative study with regards to feasibility of using a negative DC biasing approach to apply a mechanical compressive stress to a transducer's piezoelectric ceramic stack instead using a stress bolt. A typical underwater Tonpilz longitudinal-type transducer is made up of four major parts, a piezoelectric ceramic drive element that is sandwiched between two masses, a tail mass,...
This paper presents an investigation into a tunable dual-band bandstop filter (DBBSF) using a novel structure compacting a spurline section with a stepped impedance resonator. This new structure creates one new compact filter by combining two traditional controllable methodologies. This compact filter consists of a spurline section and stepped impedance resonator designed at 2 GHz and 3.5 GHz respectively...
Co-fired multiplayer ceramic capacitors sintered at lower temperatures than the melting point of silver electrode, are required to have excellent reliabilities. So the interface behaviors between bismuth-based dielectrics and silver metallic electrode, have been attracted wide attentions. Now it was found that the bismuth-based dielectric ceramics show deteriorated properties towards higher silver-fired...
Peripheral nerve lesion treatments attract extensive attention. One of the most promising treatments is guidance scaffold. It promotes cell adhesion and proliferation and their axonal growth to distal stump. PVDF was chosen as the scaffolding material due to its flexibility and piezoelectric effect. Several researches showed that PVDF membrane was capable of stimulating nerve tissue regrowth. For...
In this paper, we experimentally verify the difference between the zero reflection condition and the power maximization approach for the optimal electric loads. First, we predict those optimal loads with the KLM model for a 1–3 composite transducer that we use as a receiver, and we then perform experiments in deionized water with different ohmic loads attached to it. The measurements confirm that...
A ceramic-glass composite with high dielectric constant is fabricated by using vacuum pretreated BaTiO3 nanoparticles and SiO2 glass coating layers, the effect of process and microstructure on the dielectric properties of the composites was investigated. As the content of glass coated on BaTiO3 particles is increasing, the composites are showing the decreasing dielectric constant, decreasing dielectric...
Acceptor doping is used to achieve hard piezoelectric properties by inducing oxygen vacancies. In Bi0.5Na0.5TiO3 (BNT) based ceramics, modifying the A-site stoichiometry can be used to achieve similar effect as acceptor doping, such as bismuth deficiency that induces oxygen vacancies. In this work 0.88Bi0.50−xNa0.50TiO3 - 0.08Bi0.50−xK0.50TiO3 - 0.04BaTiO3 (BNKBT88-xBi) ceramics with bismuth deficiency...
A novel piezoelectric bridge transducer was developed for an energy harvesting application from vehicle induced loading on pavement. A unique electrode design enables the PZT to be poled horizontally, enabling the d33 piezoelectric coefficient to be utilized by the transducer, enhancing energy output. The transducers were fabricated and assembled in an energy harvesting module and the output energy...
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