Critical behavior in piezoelectric ceramics

Gaillard-Groleas, G; Lagier, Michel; Sornette, Didier

doi:10.1103/physrevlett.64.1577

Cited by 22 publications

(12 citation statements)

References 8 publications

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“…Moreover, due to the lower dielectric constant, g h is furthermore increased. Theoretical 21 and experimental 7,14,15,17 investigations have shown that their elastic, dielectric, and piezoelectric properties vary with porosity with power laws typical for percolation systems. 22 The hydrostatic FOM of porous piezoelectric materials can reach values a few orders of magnitude higher than in dense materials.…”

Section: Introductionmentioning

confidence: 97%

“…Therefore in the last decades new materials with improved piezoelectric properties and good qualities for hydroa͒ Electronic mail: floriana@idac.rm.cnr.it phone applications, obtained by introducing soft material inhomogeneities ͑e.g., voids͒ into piezoelectric ceramics and polymers, have been investigated and tested in hydrophones. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In porous piezoelectric materials, a partial decoupling between transversal and longitudinal effects avoids canceling, therefore d h increases. Moreover, due to the lower dielectric constant, g h is furthermore increased.…”

Section: Introductionmentioning

confidence: 99%

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Porous piezoelectric ceramic hydrophone

Marselli¹,

Pavia²,

Galassi

et al. 1999

The Journal of the Acoustical Society of America

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The construction and evaluation of a hydrophone based on porous piezoelectric ceramics with high d h g h figure of merit ͑FOM͒ is described. It has been shown that, in order to improve the hydrophone signal-to-noise ratio, a piezoelectric material with a high FOM should be employed. A porous piezoelectric material has been prepared by mixing calcined lead zirconate titanate ͑PZT͒ powder with fine particle starch powder. Square plate samples have been cold pressed from this material, which were then heated to eliminate the organic component, sintered, electroded, and poled in a high electric field. An optimum pore volume fraction of approximately 40% has been selected in order to obtain materials with high piezoelectric coefficients and reasonably good mechanical resistance. For this composition a hydrostatic figure of merit of approximately 10 Ϫ11 m 2 /N has been obtained that is a few orders of magnitude higher than traditional piezoceramics. Square plate elements were assembled in a planar hydrophone which was made watertight with polyurethane resin. The hydrophone was characterized by different measurements performed in a water tank, by using a pulsed sound technique. Results on acoustical sensitivity measurements, directivity, equivalent noise pressure level, and sensitivity variation with pressure are presented and discussed.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Porous piezoelectric ceramic hydrophone

Marselli¹,

Pavia²,

Galassi

et al. 1999

The Journal of the Acoustical Society of America

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“…The relaxation in porous ceramics is stronger in d 31 than in d 33 [15]. The faster decay of d 31 (in comparison to d 33 ) for the sample with anisotropic porosity (Table 1) than in the sample with isotropic porosity [37], makes it clear that it can be attributed to the pores anisotropy (pores aligned perpendicular to the direction of applied pressure). As discussed previously, the microstructure developed by using graphite as pore forming agent is anisotropic with pores and voids lengthened in direction 1 perpendicular to applied pressure during sample pressing and during piezoelectric measurements).…”

Section: Dynamic Stress Measurementsmentioning

confidence: 90%

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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“…But the predictions definitely demonstrate that the effective electrostrictive coefficients will present different scaling behavior from both the effective dielectric and elastic constants if the critical behavior is real for the effective electrostrictive coefficients, as in the case of the ͑linear coupling͒ piezoelectric effect. 11,26 This remains to be an interesting fundamental question.…”

Section: A Isotropic Particulate Compositesmentioning

confidence: 97%

Theoretical approach to effective electrostriction in inhomogeneous materials

Chen

Weng

2000

Phys. Rev. B

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An analytical approach is developed for the effective electrostriction, a nonlinearly coupled electromechanical effect, in inhomogeneous materials based on Green's-function method. For an isotropic composite containing randomly oriented ferroelectric crystallites with cubic symmetry, we derive the first effective-medium-like formulas for calculating its effective electrostrictive coefficients. The effects of microstructural features ͑such as volume fraction, crystallite shape and orientation, and connectivity of phases͒ on the effective electrostrictive coefficients are illustrated numerically and discussed. The calculations show that it is possible to develop new electrostrictors combining large electrostriction with mechanical flexibility by choosing the best combination of ferroelectric ceramics and polymer.

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Critical behavior in piezoelectric ceramics

Cited by 22 publications

References 8 publications

Porous piezoelectric ceramic hydrophone

Porous piezoelectric ceramic hydrophone

Dielectric and piezoelectric properties of PZT ceramics with anisotropic porosity

Theoretical approach to effective electrostriction in inhomogeneous materials

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