نتایج جستجو برای: piezoelectric materials
تعداد نتایج: 448155 فیلتر نتایج به سال:
Microelectromechanical systems (MEMS) incorporating active piezoelectric layers offer integrated actuation, sensing, and transduction. The broad implementation of such active MEMS has long been constrained by the inability to integrate materials with giant piezoelectric response, such as Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) (PMN-PT). We synthesized high-quality PMN-PT epitaxial thin films on vicinal...
The discovery of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution single crystals is a breakthrough in ferroelectric materials. A key signature of relaxor-ferroelectric solid solutions is the existence of polar nanoregions, a nanoscale inhomogeneity, that coexist with normal ferroelectric domains. Despite two decades of extensive studies, the contribution of polar nanoregions ...
Perovskite materials are crucial in a variety of important technological applications. Using quantum-mechanical simulations, we have computationally investigated ferroelectric materials for applications in computer memory and piezoelectric devices. We have determined that tetragonality of perovskite ferroelectrics, which is crucial for high piezoelectric performance, exhibits a quadratic depend...
Over the past century, synthetic adhesives have largely displaced their natural counterparts in medical applications. However, rising concerns over the environmental and toxicological effects of the solvents, monomers, and additives used in synthetic adhesives have recently led the scientific community to seek natural substitutes. Marine mussel adhesive protein is a formaldehyde-free natural ad...
The objective of this research was to analytically and experimentally study the capabilities of piezoelectric plate actuators for suppressing utter. Piezoelectric materials are characterized by their ability to produce voltage when subjected to a mechanical strain. The converse piezoelectric e ect can be utilized to actuate a structure by applying a voltage. For this investigation, a two-degree...
P iezoelectric materials are the key functional component in many devices, such as sensors, actuators, ultrasonic transducers, sonar systems, and energy scavengers. These applications take advantage of the direct or reverse piezoelectric effects caused by simultaneous shifts in positive and negative charge centers within the primitive unit cell in response to mechanical deformation. Ideal piezo...
and multiferroic [ 2 ] materials. For instance, ferroelectric materials at morphotropic phase boundaries (MPB), where multiple structural phases with ferroelectric polarizations pointing in different crystallographic directions coexist, often display large piezoelectric coeffi cients. [ 3– 5 ] It is the ferroelectric distortions, which accompany the polarization rotation that leads to enhanceme...
Electrical energy can be harvested from the wind using flag-like membranes (termed piezoelements or bimorphs) composed of flexible piezoelectric materials. The flapping of the membrane caused by the wind induces bending stresses which generate a voltage across electrodes positioned on the surfaces of the material via the piezoelectric properties of the material. The best results to date using P...
The concept is to capture the normally lost energy surrounding a system and converting it into electrical energy that can be used to extend the lifetime of that system’s power supply or possibly provide an endless supply of energy to an electronic device which has led to power harvesting. One of the most interesting methods of obtaining the energy surrounding a system is to use piezoelectric ma...
Following the first demonstration of fiber-based piezoelectric element that can be interfaced with external circuits in both transmitter and receiver configurations, we continue to explore the refinement of the fabrication process on novel and high performance structures: fibers with circular and rectangular cross sections have been fabricated to control the acoustic wavefronts. Fibers containi...
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