scholarly journals NOVEL LEAD ZIRCONATE TITANATE COMPOSITE VIA FREEZING TECHNOLOGY FOR HIGH FREQUENCY TRANSDUCER APPLICATIONS

2011 ◽  
Vol 01 (01) ◽  
pp. 85-89 ◽  
Author(s):  
B. P. ZHU ◽  
Q. F. ZHOU ◽  
C. H. HU ◽  
K. K. SHUNG ◽  
E. P. GORZKOWSKI ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Single Element ◽  
Central Frequency ◽  
Frequency Transducer ◽  
High Frequency Transducer

Novel PZT-5A ceramic-polymer composite was prepared via freezing technology. This composite exhibited good dielectric and ferroelectric behaviors. At 1 kHz, the dielectric constant and the dielectric loss were 546 and 0.046, respectively, while the remnant polarization was 13.0 μC/cm2 at room temperature. The electromechanical coupling coefficient (kt) of PZT-5A composite was measured to be 0.54, which is similar to that of PZT piezoelectric ceramic. The piezoelectric coefficient (d33) of PZT-5A composite was determined to be ~250 pC/N. Using this composite, a 58 MHz single element transducer with the bandwidth of 70% at –6dB was built, and the insertion loss was tested to be –29dB around the central frequency.

Influence of aspect ratio on effective electromechanical coupling of nanocomposites with lead zirconate titanate nanowire inclusion

2011 ◽  
Vol 22 (16) ◽  
pp. 1879-1886 ◽  
Author(s):  
Clark Andrews ◽  
Yirong Lin ◽  
Haixiong Tang ◽  
Henry A. Sodano
Keyword(s):  
Aspect Ratio ◽  
Mechanical Loading ◽  
Polymer Matrix ◽  
Lead Zirconate Titanate ◽  
Coupling Coefficient ◽  
High Aspect Ratio ◽  
Electromechanical Coupling ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Curved Surfaces

Piezoelectric ceramics offer exceptional sensing and actuation properties, however, they are prone to breakage and are difficult to apply to curved surfaces in their monolithic form. One method to alleviate these issues is through the use of 0–3 active composites, which are formed by embedding piezoelectric particles into a polymer matrix that protects the ceramic from breaking under mechanical loading. This class of material offers certain advantages over monolithic materials; however, they have seen little use due to the low electromechanical coupling offered by these materials. Here, we demonstrate that by controlling the aspect ratio of the filler, the electromechanical coupling coefficient can be significantly improved. For all volume fractions tested, nanocomposites with high aspect ratio lead nanowires filler had higher coupling with increases as large as 2.3 times. Furthermore, the nanocomposite’s coupling was more than 50% of the piezoceramic fillers’ when nanowires were used.

Variation of Material Properties of Piezoelectric Ceramics due to Electric Loading Evaluated by Resonance Frequency

2007 ◽  
Vol 345-346 ◽  
pp. 1521-1524 ◽  
Author(s):  
Mamoru Mizuno ◽  
Nozomi Odagiri ◽  
Mitsuhiro Okayasu
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Lead Zirconate Titanate ◽  
Material Properties ◽  
Electromechanical Coupling ◽  
Domain Switching ◽  
Piezoelectric Ceramics ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Resonance Frequencies

In the present paper, lead zirconate titanate (PZT) and lead titanate (PT) piezoelectric ceramics were subjected to both high electric field (which is higher than the coercive electric field) with low frequency and low electric field with high frequency (which is the resonance frequency). After applying certain electric field systematically, resonance and anti-resonance frequencies and an electrostatic capacity were measured by means of an impedance analyzer, and an electromechanical coupling coefficient, a dielectric constant, an elastic coefficient and a piezoelectric constant were evaluated from the frequencies and capacity measured. Then variation of the material properties in process of time was investigated experimentally, and the dependence of the variation of the properties due to mainly domain switching on conditions of applied electric field was elucidated.

scholarly journals Self-separated hydrothermal lead zirconate titanate thick films for high frequency transducer applications

2009 ◽  
Vol 94 (10) ◽  
pp. 102901 ◽  
Author(s):  
B. P. Zhu ◽  
Q. F. Zhou ◽  
J. Shi ◽  
K. K. Shung ◽  
S. Irisawa ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Thick Films ◽  
Lead Zirconate ◽  
Zirconate Titanate ◽  
Frequency Transducer ◽  
High Frequency Transducer

scholarly journals Acoustic instrumentation of the new generation of MTR: effect of nuclear radiation on modified Bismuth Titanate piezoelectric elements

2020 ◽  
Vol 225 ◽  
pp. 04012
Author(s):  
JY. Ferrandis ◽  
O. Gatsa ◽  
P. Combette ◽  
D. Fourmentel ◽  
C. Destouches ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Bismuth Titanate ◽  
Piezoelectric Materials ◽  
Lead Zirconate ◽  
Nuclear Radiation ◽  
Electromechanical Coupling Coefficient ◽  
Jozef Stefan Institute ◽  
Stefan Institute ◽  
New Generation

In this article we present a first part of the results obtained during an irradiation campaign conducted at the Jozef Stefan Institute to observe the behaviour of piezoelectric materials under gamma and neutron flux. Specific instrumentation has been developed and has enabled the monitoring throughout the irradiation of several materials such as lead zirconate titanate (PZT) or modified Bismuth Titanate (BiT) in either massive or thick film form. Various parameters such as resonance frequency, electromechanical coupling coefficient, electrical capacitance, dielectric losses were measured as a function of the flow and dose received. The results obtained confirm that the samples work up to doses of 10 18 n°/cm2 and that the behaviour of the samples varies according to their composition and form.

ELECTROMECHANICAL COEFFICIENTS OF MAGNETOELECTRIC PZT–CoFe2O4 COMPOSITE

2000 ◽  
Vol 14 (17n18) ◽  
pp. 663-674 ◽  
Author(s):  
K. SRINIVAS ◽  
G. PRASAD ◽  
T. BHIMASANKARAM ◽  
S. V. SURYANARAYANA
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Electromagnetic Coupling ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Sum Rule ◽  
Magnetoelectric Composite

The magnetoelectric property of composite materials consisting of piezoelectric and piezomagnetic constituents are of interest since the stresses induced in them on application of an external magnetic field are converted into electrical signals. The electrical output is primarily due to electromagnetic coupling between the two participating phases. The present paper deals with the evaluation of the electromechanical coupling in the magnetoelectric composite consisting of 50% lead zirconate titanate (Pb0.96Sr0.04Ti0.47Zr0.53O3) and 50% CoFe2O4, the composition having maximum magnetoelectric conversion efficiency. A sum rule is proposed to calculate the electromechanical coupling coefficient and the results are correlated with the experimental data.

scholarly journals Ferroelectric Domain Structure of PZT Tetragonal Single Crystals Analysed by Scanning Probe Microscopy

2009 ◽  
Vol 15 (S3) ◽  
pp. 83-84
Author(s):  
J. A. Pérez ◽  
I. K. Bdikin ◽  
A. M. R. Senos ◽  
P. Q. Mantas ◽  
A. L. Kholkin
Keyword(s):  
Lead Zirconate Titanate ◽  
Scanning Probe Microscopy ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Lead Zirconate ◽  
Point Of View ◽  
Scanning Probe ◽  
Coupling Coefficients ◽  
Ceramic Samples ◽  
Ferroelectric Domain Structure

AbstractFrom the application point of view, the most interesting compositions in the lead zirconate titanate solid solutions, PbZrxTi1-xO3 (PZT), are those near the centre of the phase diagram, where tetragonal and rhombohedral phases are separated by a boundary nearly independent on temperature. The composition of this so-called morphotropic phase boundary (MPB) is approximately 52/48 at room temperature. The piezoelectric coefficients, electromechanical coupling coefficients, dielectric permittivity and remnant polarization measured on ceramic samples reach a maximum in this region, not necessarily at the same composition, which explains why these compositions are technologically so interesting.

scholarly journals Piezoelectric Properties of PVDF Modified 3-3 Type Cement-Based Piezoelectric Composites

2020 ◽  
Author(s):  
Wei Liu ◽  
lehui zhang ◽  
Yu Cao ◽  
Jianhong Wang ◽  
Peikang Bai ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Coupling Coefficient ◽  
Polyvinylidene Fluoride ◽  
Electromechanical Coupling ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Piezoelectric Composites ◽  
Voltage Coefficient ◽  
Changing Trend ◽  
Piezoelectric Strain

Abstract In this study, 3-3 type cement-based piezoelectric composites were prepared by casting Portland cement paste in porous lead zirconate titanate (PZT) ceramics, then the Polyvinylidene fluoride (PVDF) of N-Methylpyrrolidone (NMP) solvent with concentration of 50-200 mg/ml was utilized to modify the PZT-PC composites. The influence of PVDF concentration on the density, microstructure, dielectric, piezoelectric and electromechanical properties were investigated. The results indicate that the density of PZT-PC composites increased gradually with PVDF concentration for the increasing combined weight of PVDF with the composites. The introduction of PVDF has also contributed to the reduction of leakage current during the poling and testing process, which led to increased relative permittivity εr and longitudinal piezoelectric strain coefficient d33, while the dielectric loss tanδ and longitudinal piezoelectric voltage coefficient g33 demonstrated an opposite changing trend. Both the thickness electromechanical coupling coefficient Kt and planar electromechanical coupling coefficient Kp of the PZT-PC composites increased with PVDF concentration. The acoustic impedance (Z) of PVDF modified PZT-PC composites ranged from 6.89 to 7.65 MRayls, making it suitable for applications in the health monitoring of civil engineering.

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