[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications

作者：Li, Fei^*; Zhang, Shujun; Luo, Jun; Geng, Xuecang; Xu, Zhuo; Shrout, Thomas R.

来源：Journal of Applied Physics, 2016, 120(7): 074105.

DOI：10.1063/1.4961202

• SINGLE-CRYSTAL
• ELECTROMECHANICAL PROPERTIES
• ULTRASONIC TRANSDUCERS

The electromechanical properties of [111]-oriented tetragonal Pb(In1/2Nb1/2O3)-Pb(Mg1/3Nb2/3O3)PbTiO3 (PIN-PMN-PT) crystals were investigated for potential high frequency ultrasonic transducers. The domain-engineered tetragonal crystals exhibit an ultrahigh free dielectric permittivity epsilon(T)(33) > 10 000 with a moderate electromechanical coupling factor k(33) similar to 0.79, leading to a high clamped dielectric permittivity epsilon(S)(33) of 2800, significantly higher than those of the rhombohedral relaxor-PT crystals and high-K (dielectric permittivity) piezoelectric ceramics. Of particular significance is that the [111]-oriented tetragonal crystals were found to possess high elastic stiffness, with frequency constant N-33 of similar to 2400 Hz m, allowing relatively easy fabrication of high-frequency transducers. In addition, no scaling effect of piezoelectric and dielectric properties was observed down to thickness of 0.1mm, corresponding to an operational frequency of similar to 24 MHz. These advantages of [111]-oriented tetragonal PIN-PMN-PT crystals will benefit high-frequency ultrasonic array transducers, allowing for high sensitivity, broad bandwidth, and reduced noise/crosstalk. Published by AIP Publishing.

• 出版日期2016-8-21
• 单位西安交通大学