Ferroelectric ceramics with included porosity for hydrophone applications

Roncari, E.; Galassi, Carmen; Craciun, F.; Guidarelli, G.; Marselli, S.; Pavia, V.

doi:10.1109/isaf.1998.786711

Cited by 5 publications

(9 citation statements)

References 5 publications

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“…19 The main physical properties of the porous samples obtained from the measurements performed on single elements ͑as described in the previous section͒ are reported in Table I, together with the corresponding properties of PZT-5A material, widely used in receiving systems. A more extensive comparison with other piezoelectric materials is given in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…19 The starch of rice was chosen for its narrower particle size distribution and its easier blending without agglomerate formation. The two component powders were dry mixed in a jar for 20 h, then standard shape samples ͑for piezoelectric characterization͒ as well as square plate samples ͑for hydrophone construction͒ have been pressed at 50 MPa.…”

Section: Porous Piezoceramic Samples Preparation and Characterizationmentioning

confidence: 99%

“…The crystallographic structure was identified by x-ray diffraction ͑XRD͒ and microstructure was investigated by scanning electron microscopy ͑SEM͒ performed on sample fracture. 19 Piezoelectric, elastic, and dielectric properties were measured on standard shape samples as recommended by IEEE standards. The piezoelectric d 33 charge coefficient was also measured by a direct method on a d 33 meter.…”

Section: Porous Piezoceramic Samples Preparation and Characterizationmentioning

confidence: 99%

“…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: Resultsmentioning

confidence: 99%

Section: Porous Piezoceramic Samples Preparation and Characterizationmentioning

confidence: 99%

Section: Porous Piezoceramic Samples Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Porous piezoelectric ceramic hydrophone

Marselli¹,

Pavia²,

Galassi

et al. 1999

The Journal of the Acoustical Society of America

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show abstract

“…Tri-dimensionally-interconnected porous ceramics are usually obtained by mixing appropriate amounts of a particulate organic substances with the ceramic powder followed by die pressing [23][24][25][26][27] ; the pore maker can be wax, polymer beads, starch or a fugitive phase material like graphite. The process involves burning off the organics.…”

Section: Dry Methodsmentioning

confidence: 99%