Porous PZT ceramics for receiving transducers

Kara, H.; Ramesh, R.; Stevens, Ron; Bowen, Chris R.

doi:10.1109/tuffc.2003.1193622

Cited by 123 publications

(87 citation statements)

References 14 publications

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“…Again, the decrease of the Young's modulus of the pore phase allows to increase the effective parameters and the maximum Table 6 Elastic, piezoelectric and dielectric characteristics of dense-soft PZT. values are always shifted towards a higher porosity volume fraction [34,43]. These results show that the configurations chosen here, the 3-0 connectivity delivers higher performance than the 3-3 connectivity.…”

Section: Modellingmentioning

confidence: 54%

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Levassort

Holc

Ringgaard³

et al. 2007

J Electroceram

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Porous ceramics are of interest for ultrasonic transducer applications. Porosity allows to decrease acoustical impedance, thus improving transfer of acoustical energy to water or biological tissues. For underwater applications, the d h g h figure of merit can also be improved as compared to dense materials. In the case of high frequency transducers, namely for high resolution medical imaging, thick film technology can be used. The active films are generally porous and this porosity must be controlled. An unpoled porous PZT substrate is also shown to be an interesting solution since it can be used in a screen-printing process and as a backing for the transducer. This paper describes the fabrication process to obtain such materials, presents microstructure analysis as well as functional properties of materials. Modelling is also performed and results are compared to measurements. Finally, transducer issues are addressed through modelling and design of several configurations. The key parameters are identified and their effect on transducer performance is discussed. A comparison with dense materials is performed and results are discussed to highlight in which cases porous piezoceramics can improve transducer performance, and improvements are quantified.

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Section: Modellingmentioning

confidence: 54%

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Levassort

Holc

Ringgaard³

et al. 2007

J Electroceram

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“…The behaviour of coupling or decoupling of the algebraic system remains the same in pure piezoelectric and PPM cases. The mutual angles θ 13 , θ 14 and θ 34 , corresponding to the pure piezoelectric case, have been computed for all the above-mentioned crystal classes and planes of propagation. Unlike the PPMs all three waves are found to be mutually orthogonal in all the crystal classes and planes of propagation (figure 14).…”

Section: Wave Propagation In the X 1 -X 2 Planementioning

confidence: 99%

Decoupling of plane waves in porous piezoelectric materials

Vashishth

Gupta

2014

Proc. R. Soc. A.

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In this paper, the analytical and numerical studies of two-dimensional wave propagation in porous piezoelectric materials (PPMs) are carried out. The decoupling of waves, in such materials for various crystal classes, is studied analytically for different coordinate planes. It is found that, for wave propagation in a plane, the system is decoupled in some crystal classes, whereas it remains coupled in other crystal classes. It is established that the decoupled pure-shear wave, propagating in a PPM, can be stiffened or unstiffened with piezoelectric effects even if the PPM belongs to the same symmetry group but has a different crystal class. The skewing angles and mutual angles between the polarization directions of different waves are also computed numerically.

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“…The FTIR spectra show a peak at 2829 cm −1 (νC-H); 1086 and 1042 cm −1 (νC-O-Pb bond); and, 573 cm −1 (νPb-O bond). 13 Lead titanate [10,11] The lead glycolate and titanium glycolate were synthesized by the OOPS process, [7 -9] whose products are less moisture-sensitive than typical metal alkoxides and the stoichiometry is easy to control. The lead titanate sol was prepared by mixing lead glycolate in a 0.1 M nitric solution (HNO 3 ) with titanium glycolate to form lead titanate glycolate with a mole ratio of Pb : Ti (PT) of 1 : 1.…”

Section: Lead Glycolatementioning

confidence: 99%

Electrorheology and characterization of acrylic rubber and lead titanate composite materials

Tangboriboon

Sirivat

Wongkasemjit

2008

Applied Organom Chemis

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Oxide one-pot synthesis was used to synthesize a polymer precursor to lead titanate, PbTiO 3 . Perovskite lead titanate, PbTiO 3 , was synthesized via the sol-gel process. The dielectric constant, electrical conductivity and loss tangent of our acrylic rubber (AR71)-lead titanate (PT) composite material (AR/PT 8) were 14.15, 2.62 × 10 −7 / m, and 0.093, respectively, measured at 27• C and 1000 Hz. SEM micrographs of composites between the AR71 elastomer and PbTiO 3 showed that the particles were reinforced within the matrix. The electrorheological properties of the AR71/PT composites were investigated as functions of electric field strength from 0 to 2 kV/mm and PbTiO 3 particle volume fraction. The storage modulus increased linearly with particle volume fraction, with or without an electric field. Without an electric field, the particles merely acted as a filler to absorb or store additional stress. With the electric field on, particle-induced dipole moments were generated, leading to interparticle interactions, and thus a substantial increase in storage modulus. With PbTiO 3 particle volume fractions as small as 10 −4 embedded in the elastomer matrix, the modulus increased by nearly a factor of 2 as the electric field strength varied from 0 to 2 kV/mm.

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Porous PZT ceramics for receiving transducers

Cited by 123 publications

References 14 publications

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Decoupling of plane waves in porous piezoelectric materials

Electrorheology and characterization of acrylic rubber and lead titanate composite materials

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