Title :
Novel piezoelectric ceramic-polymer aligned composites via the freeze casting method for high frequency transducer applications
Author :
Zhou, Q.F. ; Zhu, B.P. ; Hu, C.H. ; Shung, K.K. ; Gorzkowski, E.P. ; Pan, M.J.
Author_Institution :
NIH Transducer Resource Center & Dept. of Biomed. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
Novel piezoelectric ceramic-polymer aligned (2-2) composites were prepared via the freeze casting method. The dielectric constant of the composites versus temperature was determined. The polarization versus field plots for the PZT-5A and the PMN-10PT aligned composite samples show an good ferroelectric behavior for both samples. Kt of PZT-5A composite was measured to be 0.54, which is similar to that of single phase ceramic. The piezoelectric coefficient (d33) of PZT-5H composite was determined to be ~250 pC/N. The measured pulse echo waveform and the normalized frequency spectrum of the PZT-5A aligned composite single element ultrasound transducer showed that the center frequency of the transducer was 58 MHz and the bandwidth at -6 dB was around 70%.
Keywords :
composite materials; ferroelectric ceramics; permittivity; piezoceramics; piezoelectric transducers; polymers; ultrasonic transducers; PMN-10PT composite; PZT-5A composite; dielectric constant; ferroelectric behavior; freeze casting method; frequency 58 MHz; high frequency transducer; normalized frequency spectrum; piezoelectric ceramic-polymer aligned composite; piezoelectric coefficient; pulse echo waveform; Casting; Dielectric constant; Dielectric measurements; Ferroelectric materials; Frequency; Piezoelectric polarization; Piezoelectric transducers; Pulse measurements; Temperature; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441756
