TY - JOUR
T1 - Frequency dependent properties of high permittivity PMNT piezoelectrics for ultrasonic transducer applications
AU - Zhang, Shujun
AU - Lee, Hyeong Jae
AU - Shrout, Thomas R.
AU - Jiang, Xiaoning
AU - Luo, Jun
AU - Gerber, Eugene R.
AU - Smith, Nadine B.
PY - 2008
Y1 - 2008
N2 - Pb(Zr,Ti)O3-5H piezoelectric ceramics are widely used in medical ultrasonic applications due to their high electromechanical coupling (k 33 ≤ 75%). However, their relatively low clamped dielectric permittivity (< 1500) limits their usefulness in high frequency medical transducers with small aperture and array elements. Thus, high permittivity piezoelectric materials are desired. Relaxor based Pb(Mg1/3Nb 2/3)O3-PbTiO3 (PMNT) piezoelectrics with high permittivity and coupling have attracted much attention in medical ultrasonic applications in the form of both polycrystalline and single crystals. In this work, the electromechanical coupling of monolithic PMNT and 1-3 composites were investigated as a function of frequency. Meanwhile, fine grain size (< 1 micron) PMNT polycrystalline ceramics (dielectric permittivity >5000, coupling k33 ̃78%) were developed from the point of view of manufacturability and improved mechanical and dielectric strength. High frequency PMNT single crystal/epoxy 1-3 composites were prepared with electromechanical coupling factors in the range of 72-85%, using various fabrication methods, including dice/fill and deep reactive ion etching.
AB - Pb(Zr,Ti)O3-5H piezoelectric ceramics are widely used in medical ultrasonic applications due to their high electromechanical coupling (k 33 ≤ 75%). However, their relatively low clamped dielectric permittivity (< 1500) limits their usefulness in high frequency medical transducers with small aperture and array elements. Thus, high permittivity piezoelectric materials are desired. Relaxor based Pb(Mg1/3Nb 2/3)O3-PbTiO3 (PMNT) piezoelectrics with high permittivity and coupling have attracted much attention in medical ultrasonic applications in the form of both polycrystalline and single crystals. In this work, the electromechanical coupling of monolithic PMNT and 1-3 composites were investigated as a function of frequency. Meanwhile, fine grain size (< 1 micron) PMNT polycrystalline ceramics (dielectric permittivity >5000, coupling k33 ̃78%) were developed from the point of view of manufacturability and improved mechanical and dielectric strength. High frequency PMNT single crystal/epoxy 1-3 composites were prepared with electromechanical coupling factors in the range of 72-85%, using various fabrication methods, including dice/fill and deep reactive ion etching.
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U2 - 10.1109/ULTSYM.2008.0065
DO - 10.1109/ULTSYM.2008.0065
M3 - Conference article
AN - SCOPUS:67649335581
SN - 1051-0117
SP - 265
EP - 268
JO - Proceedings - IEEE Ultrasonics Symposium
JF - Proceedings - IEEE Ultrasonics Symposium
M1 - 4803461
T2 - 2008 IEEE International Ultrasonics Symposium, IUS 2008
Y2 - 2 November 2008 through 5 November 2008
ER -