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JIANG, Y. THONGCHAI, T. BAI, Y. MEGGS, C. BUTTON, T. MATOUŠEK, A. TOFEL, P. HUGHES, H.
Original Title
Lead-free piezoelectric materials and composites for high frequency medical ultrasound transducer applications
Type
conference paper
Language
English
Original Abstract
Lead-free ceramics based on the (1-x)Ba(Zr0.2Ti0.8)O3- x(Ba0.7Ca0.3)TiO3 (BZT-BCT) system have been reported to exhibit piezoelectric properties comparable to lead zirconate titanate ceramics, and are thus being considered as replacement materials for some applications. In this work, the possibility of fabricating BZT-BCT based 1-3 piezocomposites for high frequency ultrasound imaging has been explored. An investigation of the interdependence of synthesis, processing and sintering conditions on the physical, structural, microstructural and functional properties of piezoelectric compositions in the BZT-BCT system has been carried out. Ceramic powders with a composition of 0.5BZT-0.5BCT and a particle size of 1 um were chosen for the fabrication of the ceramic segments which were subsequently sintered at 1425 C. A novel randomised pattern that has recently demonstrated its advantages in suppressing undesirable spurious resonances was adopted for the lead-free composites and a micro-moulding technique based on gel casting ceramic processing has been used for the fabrication of the composites. A 0.5BZT-0.5BCT based randomised composite operating at ~30 MHz with an electromechanical coupling factor of 0.63 has been achieved.
Keywords
(BaCa)(ZrTi)O3 ceramics; piezoelectric; lead-free; processing; Piezoelectric composite; High frequency transducer; Gel-casting
Authors
JIANG, Y.; THONGCHAI, T.; BAI, Y.; MEGGS, C.; BUTTON, T.; MATOUŠEK, A.; TOFEL, P.; HUGHES, H.
RIV year
2014
Released
3. 9. 2014
ISBN
978-1-4799-7049-0
Book
Ultrasonics Symposium (IUS), 2014 IEEE International
Edition
1
Pages from
903
Pages to
906
Pages count
4
BibTex
@inproceedings{BUT109247, author="Yun {Jiang} and Tanikan {Thongchai} and Yang {Bai} and Carl {Meggs} and Timothy William {Button} and Aleš {Matoušek} and Pavel {Tofel} and Hana {Hughes}", title="Lead-free piezoelectric materials and composites for high frequency medical ultrasound transducer applications", booktitle="Ultrasonics Symposium (IUS), 2014 IEEE International", year="2014", series="1", pages="903--906", doi="10.1109/ULTSYM.2014.0221", isbn="978-1-4799-7049-0" }