Piezoelectric PMN-PT fibre hydrophone for ultrasonic transducer calibration

The University of Hong Kong, Hong Kong, 00, Hong Kong
Applied Physics A (Impact Factor: 1.7). 12/2004; 80(1):105-110. DOI: 10.1007/s00339-004-2908-3


A newly developed ceramic fibre hydrophone with an active element as small as 0.25mm in diameter is described in this work. Lead magnesium niobate-lead titanate (PMN-PT) ceramic fibre with a nominal composition of 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 was fabricated by an extrusion method. PMN-PT single crystals were ground to a powder form and then mixed with poly(acrylic) acid to form a homogenous slurry. The fibre was extruded by pressing the slurry through a spinneret and then sintering at 1250C for crystallization. The electrical characteristics of the PMN-PT fibre were evaluated by measuring the relative permittivity and the impedance spectrum. A piezoelectric PMN-PT fibre hydrophone was fabricated and its sensitivity, angular response, and spatial resolution were evaluated. The fibre hydrophone provides good spatial resolution, angular response and receiving sensitivity.

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    • "Relaxor ferroelectrics materials have attracted much attention due to their very large piezoelectric response and unique dielectric behavior [1]. The large dielectric permittivity and electromechanical constants make these materials very attractive for actuators, multilayer capacitor structures, displacement transducers, and microelectromechanical systems-based applications [2] [3] [4] [5] [6]. The main problem during preparation of Pb(Mg 1/3 Nb 2/3 )O 3 (PMN)-based materials is the appearance of various undesirable pyrochlore phases, which results in the reduction of dielectric properties. "
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    ABSTRACT: The sintering characteristic and dielectric properties of 0.67PMN–0.33PT ceramics prepared by the molten salt synthesis (MSS) method were investigated. PMN–PT particles synthesized by MSS with smaller grain size and good dispersion could lower the sintering temperature of ceramics; PMN–PT ceramics with relative density above 96% could be obtained in the range 1150–1180 °C. The molten salts species could significantly affect the microstructure and properties of MPN-PT ceramics. In the range 1100–1200 °C, PMN–PT ceramics from the sulfate flux MSS powders showed intergranular fracture, but that from the chloride flux MSS powder showed transgranular fracture. At the same sintering condition, the properties of PMN–PT ceramics from the powders prepared in the chloride flux are better than that from the powders prepared in the sulfate flux, their maximum dielectric constant εmax≈29,385 and piezoelectric constant d33≈660 pC/N. The above results demonstrated that PMN–PT ceramics prepared by the molten salts method possessed excellent piezoelectric and dielectric properties.
    Full-text · Article · Jan 2009 · Journal of Physics and Chemistry of Solids
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    ABSTRACT: A bibliography is given containing 1887 references published during 2004 on piezoelectric and pyroelectric properties of materials and their applications. It contains listings of journal articles and patents with complete bibliographic citations. Journal and patent references from 2004 in which the first author's name began with letters between A and K were given in Guide 25 (published previously). Journal articles and patents by authors with names beginning with the letters L through Z are published in the present Guide. This bibliography is the continuation of a series published semi-annually.
    No preview · Article · Apr 2006 · Ferroelectrics
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    ABSTRACT: A (001) single-crystal plate PbMg1/3Nb2/3O328 mol %PbTiO3 was investigated by wide-angle X-ray scattering at room temperature in situ under the influence of an external static electric field E, applied along the [001] direction of the specimen. Excluding an initial stage of the electric field processing, the induced strain s calculated from the change of interplanar spacing, exhibited a symmetrical increase with |E|, and an anhysteretic character of the s(E) dependence, during unidirectional loops of the applied electric field. Reasons for the observed s(E) behaviour are discussed.
    Full-text · Article · May 2006 · Applied Physics A
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