Experimental Evaluation Cylindrical Ceramic Tubes Composed of Porous Pb(ZrTi)O₃ Ceramics

Abstract

The experimental evaluation of cylindrical ceramic tubes composed of porous PZT ceramics is reported. They exhibit 5.5 dB higher electroacoustic sensitivity and 20% lower resonant frequency than those composed of conventional PZT ceramics.

Porous piezoelectric ceramic hydrophone

“…Therefore in the last decades new materials with improved piezoelectric properties and good qualities for hydroa͒ Electronic mail: floriana@idac.rm.cnr.it phone applications, obtained by introducing soft material inhomogeneities ͑e.g., voids͒ into piezoelectric ceramics and polymers, have been investigated and tested in hydrophones. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In porous piezoelectric materials, a partial decoupling between transversal and longitudinal effects avoids canceling, therefore d h increases. Moreover, due to the lower dielectric constant, g h is furthermore increased.…”

Pyroelectric performance of porous Ba0.85Sr0.15TiO3 ceramics

“…In this direction, few lead‐free porous ceramics based on modified BaTiO 3 (BT) have been recently reported such as Ba 0.5 Sr 0.5 TiO 3 and Ba 0.67 Sr 0.33 TiO 3 for their excellent pyroelectric properties, figure of merits (FOMs), and superior device performance . Moreover, air inclusions in the materials can help in reducing the effective acoustical impedance, thereby improving the acoustic matching between the component and the media through which signals could be transmitted/received which could improve the mismatch of acoustic impedances at the interfaces of medical ultrasonic imaging devices or underwater sonar detectors . The Ba x Sr 1‐x TiO 3 ceramics have been documented in literature for excellent pyroelectric and piezoelectric properties.…”

Modification of microstructure on PZT films for ultrahigh frequency transducer

“…Earlier studies have reported the dielectric and ferroelectric properties of porous PZT ceramics [8][9][10][11][12][13][14]. In comparison with the dense ceramics, the porous ones exhibit much lower dielectric constant and lower acoustic impedance, which makes them suitable for the fabrication of ultrahigh frequency transducers [15][16][17].…”