Abstract
Two types of piezoelectric ceramics with large electromechanical anisotropies (planar coupling factor kp is much less than thickness dilatational coupling factor kt) have been developed for use as high-frequency ultrasonic transducer materials: modified lead titanate ceramics (Pb, Sm)(Ti, Mn)O3 and ferroelectric PbZrO3 ceramics modified by adding small amounts of Pb(Mn1/3Nb2/3)O3 and PbTiO3. These new ceramics have a large kt and kt/kp. PZT/polymer piezoelectric composite sheets have also been developed for use in medical transducers. These composite sheets were fabricated using a “dicing and filling” technique. The resulting composites are highly flexible and show both a large kt and a low acoustic impedance.
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