Modified-Lead-Titanate/Polymer Composites for Hydrophone Applications
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DETACHMENT
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Composite piezoelectrics made from Calcium modified lead titanate rods embedded in a polymer matrix have been evaluated for hydrophone applications. These composites behave quite differently form the conventional 1- 3 composites made with lead zirconate titanate ceramics. Specifically, in the modified lead titanate case the magnitude of the d31 coefficient is enhanced in the composite structure, and consequently the hydrostatic dh coefficient is suppressed. Nevertheless, these composites exhibit a large gh coefficient and a remarkable pressure stability. An analysis shows that a substantial contribution to the composites d31 coefficient arises from internal stresses which develop along the ceramic rods and produce a piezoelectric charge through the d33 coefficient of the ceramic. This effect particularly pronounced in the composite structure of the modified lead-titanate ceramic since the ratio d33d31 in this ceramic is exceptionally large.
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