Title :
Single crystal Pb(Zn1/3Nb2/3)O3/PbTiO3 (PZN/PT) in medical ultrasonic transducers
Author :
Lopath, Patrick D. ; Park, Seung-Eek ; Shung, K. Kirk ; Shrout, T.R.
Author_Institution :
Dept. of Bioeng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
Solid solutions of Pb(Zn1/3Nb2/3)O3 (PZN) and PbTiO3 (PT) have been grown in single crystal form to sizes large enough to permit the fabrication of a 5 MHz phased array. Transducer construction techniques employed differ from standard ceramic arrays. Crystallographic alignment is found to be a significant contributor to piezoelectric performance. The crystal structure and phase diagram play a major role in processing steps requiring heating such as poling and electroding. A complex composite structure is utilized to allow for efficient operation while maintaining structural integrity. The pulse-echo performance and insertion loss of this array are found to be superior to a similarly constructed PZT 5H array
Keywords :
biomedical transducers; biomedical ultrasonics; crystal orientation; lead compounds; phase diagrams; piezoceramics; piezoelectric transducers; ultrasonic transducer arrays; 5 MHz; 5 MHz phased array; PZN/PT; PbZnO3NbO3-PbTiO3; Single crystal Pb(Zn1/3Nb2/3)O3/PbTiO3; complex composite structure; crystal structure; crystallographic alignment; efficient operation; electroding; fabrication; heating; insertion loss; medical ultrasonic transducers; phase diagram; phased array design; piezoelectric performance; poling; pulse-echo performance; solid solutions; structural integrity; transducer construction techniques; Ceramics; Crystallography; Fabrication; Heating; Insertion loss; Niobium; Performance loss; Phased arrays; Piezoelectric transducers; Solids;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663309
