Abstract
The dielectric and piezoelectric properties of a calcium-modified PbTiO3 ceramic were determined as a function of pressure from 0 to 70 MPa by using an acoustic reciprocity technique. The transverse piezoelectric coefficients (d31, g31) of this material are very small, which results in high values of hydrostatic gh (=g33+2g31) and dh (=d33+2d31) constant. Consequently, the material is considerably more sensitive than lead zirconate titanate (PZT). Measurements of the resonance properties of this ceramic indicated that it is suitable for use in a high-frequency underwater transducer. Prototype transducers were designed and constructed. The free-field voltage sensitivity was measured over the frequency ranges 1–100 kHz and from 200 kHz–2 MHz. The results of these measurements are compared with those obtained from existing high-frequency hydrophone standards. Since this material is a volume expander, it is very useful for electroacoustic transducer applications.
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