Lead zirconate titanate

About: Lead zirconate titanate is a research topic. Over the lifetime, 7141 publications have been published within this topic receiving 150878 citations.

The influences of the material properties on ceramic micro-stereolithography

Abstract: Ceramic micro-stereolithography (μSL) was recently introduced in the fabrication of complex 3D ceramic microstructures. Light scattering is found as an important factor in the μSL of ceramics. In this work, the Monte Carlo ray tracing method is employed to investigate the influences of the important materials properties on the scattering during the ceramic μSL. It is found that the scattering is the strongest when the size of the ceramic powders approaches to the laser wavelength (0.364 μm). It was also found that the higher the refractive index contrast between the particle and the resin, the stronger the light scattering. High laser intensity is required to fabricate absorbing ceramic materials to compensate for the laser energy absorbed by the ceramic particle. The μSL of three typical ceramic powders: silica, alumina, and lead zirconate titanate (PZT) are examined by the numerical model. The numerical model has been demonstrated as an efficient tool to optimize the μSL process. Finally, the ceramic micro green structures have been successfully fabricated.

Grain-size effect on ferroelectric P b ( Z r 1 − x Ti x ) O 3 solid solutions induced by surface bond contraction

Abstract: Bond contraction in the surface layers induces a compressive stress on the inner part of a grain and results in a size effect for ferroelectric materials in the nanometer size range. By using the Landau-Ginsburg-Devonshire free energy approach, the phase transitions and intrinsic ferroelectric properties of the lead zirconate titanate solid solution system have been studied theoretically. It is found that, due to the surface bond contraction, the phase stability is affected by grain size and the size-dependent properties show differences in different phases.

A novel micropump design with thick-film piezoelectric actuation

Abstract: A new design for a silicon-based micropump is described. Passive cantilever valves are produced by boron etch stop and fusion bonding. Tests of these valves show good performance, as no flow could be detected in the reverse direction. Initial experiments on a thick-film screen printed piezoelectric membrane actuator were undertaken. A study of suitable inks for electrodes on different insulation layers on silicon yielded silicon dioxide and cermet gold ink as the most satisfactory combination. Deflection measurements of a mm PZT (lead zirconate titanate) - bimorph membrane gave movement at an applied voltage of 100 V. A quasi-static simulation package of the flow through a micropump is also presented. The valve action is simulated using ANSYS coupled with FLOW3D. The piezoelectric membrane deflection is simulated with ANSYS. A differential equation for the combined actuation of membrane and valves is solved numerically with Maple. Pump rates of up to and a maximum backpressure of up to 70 kPa for a driving voltage of 40 V have been modelled using bulk values for PZT-5H. A pump rate of up to and a maximum backpressure of up to 35 kPa at 100 V driving voltage are predicted using thick-film parameters extracted from the measurements.

Non-Ising and chiral ferroelectric domain walls revealed by nonlinear optical microscopy.

Abstract: The properties of ferroelectric domain walls can significantly differ from those of their parent material. Elucidating their internal structure is essential for the design of advanced devices exploiting nanoscale ferroicity and such localized functional properties. Here, we probe the internal structure of 180° ferroelectric domain walls in lead zirconate titanate (PZT) thin films and lithium tantalate bulk crystals by means of second-harmonic generation microscopy. In both systems, we detect a pronounced second-harmonic signal at the walls. Local polarimetry analysis of this signal combined with numerical modelling reveals the existence of a planar polarization within the walls, with Neel and Bloch-like configurations in PZT and lithium tantalate, respectively. Moreover, we find domain wall chirality reversal at line defects crossing lithium tantalate crystals. Our results demonstrate a clear deviation from the ideal Ising configuration that is traditionally expected in uniaxial ferroelectrics, corroborating recent theoretical predictions of a more complex, often chiral structure. Understanding the structure of domain walls is an important step in developing nanoscale ferroelectric devices. Here, the authors use second harmonic imaging to verify predictions of Bloch and Neel, rather than simple Ising, domain wall structures in lead zirconium titanate and lithium tantalate.

A Self-Tuning Piezoelectric Vibration Absorber

Abstract: A self-tuning piezoelectric vibration absorber is presented. A piezoelectric absorber, similar to a mechanical vibration absorber, has to be tuned to a particular structural vibration mode in order to be effective. The absorber presented here will tune itself to a particular mode and track that mode if it varies in frequency. Design of the aborber consists of a pair of lead zirconate titanate (PZT) tiles attached to the structure and shunted by an inductor-resistor circuit. This produces an electrical resonance that can be tuned to the desired structural mode by a simple control system. The absorber is experimentally demonstrated on a cantilevered beam. The experiments include an ex amination of the response of the absorber to an abrupt change in system parameters.