Porous PZT ceramics for receiving transducers

Author

Kara, Hudai ; Ramesh, Rajamani ; Stevens, Ron ; Bowen, Chris R.

Author_Institution

Dept. of Eng. & Appl. Sci., Univ. of Bath, UK

Volume

50

Issue

3

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

289

Lastpage

296

Abstract

PZT-air (porous PZT) and PZT-polymer (polymer impregnated porous PZT) piezocomposites with varying porosity/polymer volume fractions have been manufactured. The composites were characterized in terms of hydrostatic charge (d/sub h/) and voltage (g/sub h/) coefficients, permittivity, hydrostatic figure of merit (d/sub h/.g/sub h/), and absolute sensitivity (M). With decreasing PZT ceramic volume, g/sub h/ increased, and d/sub h/.g/sub h/ had a broad maximum around 80 to 90% porosity/polymer content. The absolute sensitivity was also increased. In each case, PZT-air piezocomposites performed better than PZT-polymer piezocomposites. Hydrophones constructed from piezocomposites showed slightly lower measured receiving sensitivities than calculated values for piezocomposite materials, which was due to the loading effect of the cable and the low permittivity associated with the piezocomposites.

Keywords

ceramics; hydrophones; permittivity; piezoelectric transducers; ultrasonic transducers; PZT; PbZrO3TiO3; absolute sensitivity; hydrophones; hydrostatic charge; hydrostatic figure of merit; loading effect; permittivity; piezocomposites; polymer impregnated porous PZT; porosity/polymer volume fractions; porous PZT; receiving sensitivities; receiving transducers; Acoustic transducers; Ceramics; Ferroelectric materials; Polymers; Powders; Sonar applications; Sonar equipment; Stress measurement; Thickness measurement; Voltage;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2003.1193622

Filename

1193622