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Showing 1 to 20 of 172 for “"PZT"”.
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Modeling, simulation, and fabrication of a PZT valveless micropump
… tested, and implemented. Among them, a PZT valveless micropump is receiving increasing attentions due to its unique advantages over a conventional check-type micropump. A valveless micropump is short of fatigue and wear of movable part. Without movable parts in the device may avoid …
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Directed Colloidal Assembly and Characterization of PZT -Polymer Composites
Concentrated (&phis;PZT = 0.47) PZT-5H gels were developed as inks for the robotic deposition of 3-D, mesoscale periodic structures with self-supporting features such as lattices of rod-like elements and v-shaped test structures. The gels exhibited pH dependent viscoelastic properties and …
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Electromechanical response of textured ferroelectric PZT thin film stacks
… coefficients such as PbZr0.52Ti0.48O3 (PZT) offer several advantages to microelectromechanical systems (MEMS) due to their low power requirements, large displacements, high work and power densities, as well as high sensitivity in a wide dynamic range. The performance of PZT-based MEMS …
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Ink jet printing of PZT thin films for MEMS
… perovskite phase lead zirconate titanate (PZT) has the strongest mechanical to electrical coupling. PZT based devices have the potential to have the highest performance. Due to the strong piezoelectric response and low operating voltage, many groups have worked to integrate thin film PZT …
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Optimization of PZT processing using thermal ink-jet printing
Lead zirconate titanate (PZT) has been known for its strong piezoelectric property for micro-sensors and actuators. Yet, its use in MEMS has been constrained by limitations in processing PZT with current MEMS fabrication technology. The direct printing of PZT, in place of traditional manufacturing …
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Electromechanical behavior of PZT thin film composites for RF-MEMS
Made available in DSpace on 2010-01-06T16:41:50Z (GMT). No. of bitstreams: 3 license.txt: 4071 bytes, checksum: e75615bc0da3d84c9388e446b2f8f791 (MD5) Yagnamurthy_Sivakumar.pdf: 7086653 bytes, checksum: 811d92a8497f2ba0a1e4f56aceee8970 (MD5) Yagnamurthy_Sivakumar.doc: 8453120 bytes, checksum: …
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Frequency Domain Authentication Using Piezoelectric PZT Disks as Hardware IDs
… will be on utilizing a lead zirconate titanate (PZT) thin cylinder (disk) as a hardware ID, based on the response of its various entropy sources to a frequency sweep. Those entropy sources explored by this work are the admittance peak magnitudes, resonance frequencies, quality factor of the …
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Analysis of the sensing region of a PZT actuator-sensor
… [1-3]. This new technique uses piezoceramic (PZT) patches as actuator-sensors to provide a low-power driven constant voltage dynamic excitation, and to record the modulated current flow through the structure. Therefore, it relies on tracking the electrical point impedance to identify incipient …
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Processing Effects for Integrated PZT: Residual Stress, Thickness, and Dielectric Properties
… ferroelectric and piezoelectric properties of PZT films without convolution from the other major variables. The research provides a guideline for the tailoring of properties by modifying mechanical stress in polarizable and deformable thin films.
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Direct liquid injection metalorganic chemical vapor deposition of ferroelectric PZT films
… deposit ferroelectric lead zirconate titanate (PZT) films for the first time. By utilizing a cheap DLI precursor delivery system, the problems encountered in the conventional precursor delivery system by bubblers were eliminated. Highly uniform PZT films with a spatial variation in film …
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An efficient drive, sensing, and actuation system using PZT stack actuator cells
The PZT cellular actuator developed in the MIT d'Arbeloff Laboratory utilizes small-strain, high-force PZT stack actuators in a mechanical flexure system to produce a larger-strain, lower-force actuator useful in robotic systems. Many functionalities for these cellular actuators are developed which …
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Synthesis of electric networks interconnecting PZT actuators to efficiently damp mechanical vibrations
The aim of this thesis is to show that it is possible to damp mechanical vibrations in a given frame, constituted by Euler beam governed by the equations of an elastica, by means of piezoelectric actuators glued on every beam and interconnected each other via electrical networks.Since we believe …
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Equilibrium of a shallow arch subjected to PZT actuators and a deadweight load
The geometrically nonlinear response of a shallow, circular, cylindrical panel under a midspan line load and induced strain actuation is presented. The panel is a laminate of piezoelectric material perfectly bonded to the convex and concave surfaces of a core of passive material. Since the curved …
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Optimierung des PbO-Haushaltes in undotierten und SKN-substituierten PZT-Fasern: Gefüge und Eigenschaften
… substituierten Bleizirkonat-Bleititanat-Fasern (PZT), die über die Sol-Gel-Route hergestellt worden waren. Die Kontrolle der Gefügeausbildung und der damit zusammenhängenden funktionalen Eigenschaften in den Fasern erfolgte über drei Wege: (1) über eine Optimierung des PbO-Gehaltes im Spinnsol, …
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Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)
… thin film deposition of lead zirconate titanate (PZT) is defined. Through high frequency vibration (1-16MHz) of a thin plate, the PMUT transmits and receives pressure pulses to construct medical ultrasound images as an alternative to bulk piezoelectric transducers currently in use. Existing …
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Einfluß der Korngröße auf die morphotrope Phasengrenze in Sol-Gel abgeleiteten Nd-dotierten PZT-Keramiken
Bleizirkonattitanat-Keramiken (PZT) werden für die Anwendung als Sensor oder Aktuator in vielfältigen Geometrien und über sehr unterschiedliche Verfahren hergestellt. Aus technologischenGründen ergeben sich bei einigen dieser Verfahren Besonderheiten im Gefüge wie z.B.ein hoher Porenanteil oder …
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Technological process for the fabrication of a MEMS microswitch actuated by a PZT thin film
… a 2 μm thick silicon nitride film, actuated by a PZT thin film. Silicon wafers finished with a silicon nitride film bring to a fabrication process simpler and faster than a process that employs SOI wafers. A big problem to face is the growth of PZT films with good piezoelectric properties with …
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Electrical properties of doped and undoped PZT thin films prepared by a sol-gel method
… zirconate titanate Pb(Zr<sub>x</sub>Ti₁)O₃ (i.e. PZT) thin films are the major limitations for commercial memory applications of these films. It is noted that the presence of oxygen vacancies and their entrapment at the electrode-ferroelectric interfaces are the sources of the degradation …
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Investigating Ferroelastic and Piezoelectric Vibration Damping Behavior in Nickel-Barium Titanate and Nickel-PZT Composites
… titanate (BaTiO3) and lead zirconate titanate (PZT) is due to the anelastic response of ferroelastic domain walls to applied external stress. In piezoelectric ceramics, vibration energy can also be dissipated through the direct piezoelectric effect if the appropriate electric circuit is …
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