Title :
Relaxor ferroelectric transducers
Author :
Takeuchi, Hiroshi ; Masuzawa, Hiroshi ; Nakaya, Chitose ; Ito, Yukio
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
Novel ultrasonic transducers whose sensitivity can be controlled with a DC bias field have been developed by utilizing relaxor ferroelectrics as a transducer material in place of conventional piezoelectrics. Relaxor ferroelectrics have a large bias-field-induced piezoelectricity as well as a giant electrostrictive effect due to their extremely large dielectric constant (~104). Pb(Mg1/3 Nb2/3)O3 (PMN) is a typical relaxor ferroelectric having a diffuse phase transition at around 0°C. The addition of 9 mol.% of PbTiO3 to the PMN is found to produce a transducer material whose electromechanical coupling factor for the thickness mode is comparable to that of PZT ceramics for a practical DC bias field. It is suggested that the application of recent piezoceramic/polymer composite technology to this relaxor ferroelectric transducer can play an important role in developing two-dimensional arrays
Keywords :
acoustic arrays; electrostriction; ferroelectric devices; ferroelectric materials; lead compounds; permittivity; piezoelectric materials; piezoelectric transducers; ultrasonic transducers; DC bias field; PMN; PMNPbTiO3; PbMgO3NbO3; PbMgO3NbO3PbTiO3; PbTiO3; bias-field-induced piezoelectricity; dielectric constant; electromechanical coupling factor; giant electrostrictive effect; piezoceramic/polymer composite technology; relaxor ferroelectrics; sensitivity; thickness mode; two-dimensional arrays; ultrasonic transducers; Dielectric constant; Dielectric materials; Electrostriction; Ferroelectric materials; Niobium; Piezoelectric materials; Piezoelectric transducers; Piezoelectricity; Relaxor ferroelectrics; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171454
