On the recent progress of piezoelectric composites

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The historical process in the development of piezoelectric composites was briefly described, and the structures and performances of piezoelectric composite with different connectivities for hydrophone were reviewed. The methods for preparing piezoelectric composites of large-area and fine-size were introduced, and the new generation of piezoelectric composites was discussed.

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In this paper, the 1-3 connectivity piezoelectric ceramic-polymer composites based on 0.90Pb(Zr0.52Ti0.48)O3-0.05Pb (Mn1/3Sb2/3)O3-0.05Pb (Zn1/3Nb2/3)-O3 fibers and epoxy were fabricated by viscous-polymer processing with volume fraction of piezoelectric fibers for 0.5, by which the average diameter of piezoelectric fibers were 300 μm with an aspect ratio(height/diameter) higher than 3.The dielectric, piezoelectric, ferroelectric properties and the vibration mode of the 1-3 composites were measured and compared with the monolithic piezoelectric ceramics, where the 1-3 composites show low acoustic impedance (Z) of 10 M Rayl, the higher thickness coupling coefficient (kt) of 0.59 and a clear single thickness mode with the frequency over 1.5 MHz. In addition, it was found that the properties including thickness coupling coefficient (kt), dielectric constant (εr), the ratio of kt to kp (kt /kp), acoustic impedance (Z) increase as temperature increases, and only planar electromechanical coupling coefficient (kp) showed the trend of decreasing. With the measure of temperature-dependent properties within 100°C, the 1-3 composites indicate relatively temperature stability, and the ratio(kt/kp) increased to 3.6 at 100°C, which is suitable to have applications on many fields like ultrasonic transducers, hydrophones, non-destructive testing.
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