Effective electroelastic moduli of 3-3(0-3) piezocomposites

Levassort, Franck; Lethiecq, Marc; Desmare, Rozenn; Tran-Huu-Hue,

doi:10.1109/58.775670

Cited by 49 publications

(32 citation statements)

References 18 publications

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“…The modelling used in this paper is based on a method developed in previous work, and adapted to porous piezoelectric materials [27][28][29]. Here, the method is based on the generalisation of series and parallel connections (corresponding to 2-2 connectivity) [30] and modified cubes model [31].…”

Section: Modellingmentioning

confidence: 99%

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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: 99%

“…For the calculation of effective properties, only the principle is recalled here, detailed description can be found in [29]. The basis of this matrix method is to define two vectors (G) and (H) which each contain nine components.…”

Section: Modellingmentioning

confidence: 99%

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

Levassort

Holc

Ringgaard³

et al. 2007

J Electroceram

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“…Figures 4 and 5 represent evolutions of the dielectric constant at constant strain and thickness coupling factor as a function of single crystal volume fraction (SC V f ) for three simulated connectivities (0-3, 3-0 and 3-3). Results show that small variations appear between the connectivities and so the arrangement between phase does not seem to be predominant for the effective properties, contrary to piezocomposites based on one piezoelectric phase and one inert phase (typically a polymer) [11]. These results show clearly that in all cases, a high volume fraction of single crystal and consequently a high degree of texturing is essential to significantly increase the performance (in particular the thickness coupling factor which represents the major parameter to deliver high transducer performance) of the textured piezoelectric ceramics.…”

Section: Modellingmentioning

confidence: 60%

“…3) are easily related to the volume fraction of single crystal in the material. The different steps for the calculation are detailed in [10,11]. A generalisation of the series and parallel analysis developed for 2-2 connectivity (stack of alternative layers of single crystal and ceramic) with a matrix resolution is used.…”

Section: Modellingmentioning

confidence: 99%

Ultrasonic transducer based on highly textured PMN-PT piezoelectric ceramic

et al. 2007

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A successful fabrication process of textured ceramics by homo-template grain growth (HTGG) is described. Two samples fabricated with this technique were characterised. Functional properties obtained are competitive with for example a thickness coupling factor over 50%. Different characteristics were compared with those obtained by a unit cell model previously developed for piezocomposites and extended to the case of two piezoelectric phases. Behaviours of several connectivities (0-3, 3-0 and 3-3) are calculated and results show that the spatial arrangement does not have a great influence on effective parameters. A transducer based on a textured ceramic sample has been fabricated and characterised. The measured performance shows the efficiency of these new piezoelectric materials. Finally, electroacoustic responses of identical single element transducer configurations have been simulated. They show that a sensitivity increase of 3dB can be obtained at equivalent relative bandwidth of 40% with textured ceramic sample in comparison with PMN-PT ceramic used as a matrix in the textured ceramic.

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“…Studying " T 33 and " T 11 of the composite, a quantitative evaluation of the mean electrical circuit associated to this microstructure can be obtained, assuming that at the frequency of 1 kHz the relaxation effects are negligible [17][18][19][20][21][22][23][24][25][26][27][28][29]. The complexity of the microstructure is confirmed by the anisotropy of the dielectric constant of unpoled samples.…”

Section: Dielectric Permittivity At 1 Khzmentioning

confidence: 95%

Dielectric and piezoelectric properties of PZT ceramics with anisotropic porosity

et al. 2008

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Pb(Zr,Ti)O 3 ceramics with homogenous, anisotropic porosity were manufactured and the influence of the anisotropic porosity on the dielectric and piezoelectric properties was studied. Image analysis allowed the quantification of the preferential orientation and the calculation of the distribution of the aspect ratio of the pores. The different dependence of the permittivities " T 33 and " T 11 on the porosity content demonstrates that the population of pores is constituted of a high volume of pores with low aspect ratio and a low volume of pores with high aspect ratio. In view of the quantitative results obtained on the microstructure, an explanation of the frequency dependence of the dielectric and piezoelectric behaviour is suggested. Furthermore, the higher d 31 piezoelectric coefficient in the material with anisotropic pores than in material with isotropic pores is related to higher effective fields which are a consequence of the enhanced longitudinal mobility of the material under transverse stress.

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Effective electroelastic moduli of 3-3(0-3) piezocomposites

Cited by 49 publications

References 18 publications

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

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

Ultrasonic transducer based on highly textured PMN-PT piezoelectric ceramic

Dielectric and piezoelectric properties of PZT ceramics with anisotropic porosity

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