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

Abstract

Shrout, T. R. (2016).[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications. Journal of Applied Physics, 120 (7), 074105-1-074105-5.[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications AbstractThe 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 ε33 T > 10 000 with a moderate electromechanical coupling factor k33 ∼ 0.79, leading to a high clamped dielectric permittivity ε33 S 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 N33 of ∼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 0.1 mm, corresponding to an operational frequency of ∼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. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsLi, F., Zhang, S., Luo, J., Geng, X. [111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications T > 10 000 with a moderate electromechanical coupling factor k 33 $ 0.79, leading to a high clamped dielectric permittivity e 33 S 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 $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 0.1 mm, corresponding to an operational frequency of $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. [http://dx

Enhanced Ferroelectric, Dielectric Properties of Fe-Doped PMN-PT Thin Films

“…The α 111 of PMN-PT-2Fe thin films with the annealing temperature of 600, 650 and 700 • C were 76%, 90% and 74%, respectively. The highly (111) preferred orientation will lead to the excellent electrical performances of PMN-PT thin films [19]. The crystallization of PMN-PT-xFe thin films as a function of doping concentration of Fe element is shown in Figure 1b.…”

Ferroelectric Polymer Nanofibers Reminiscent of Morphotropic Phase Boundary Behavior for Improved Piezoelectric Energy Harvesting

“…In the field of ferroelectric ceramics, the morphotropic phase boundary (MPB) is a very essential concept to enhance piezoelectric characteristics. [11,[28][29][30] MPB is the vertical phase boundary of a certain phase diagram, where two or more phases can especially coexist. Because the two phases compete structurally from the atomic-scale and crystallographiclevel perspective, ferroelectric dipoles become more thermally dynamic, and polarization changes occur more easily.…”

“…[30,36] In this way, P(VDF-TrFE) is quite similar to PMN-PT ceramic systems with high piezoelectricity, which also possess both the MPB region and relaxor ferroelectric characteristics. [28,37,38] Nonetheless, there is no investigation for piezoelectric device applications and derived fabrication processes in this extremely important field of electroactive polymers because the MPB-associated phase competition and transition of ferroelectric P(VDF-TrFE) polymers is still a very early stage research topic, in contrast to ferroelectric ceramics. [30][31][32] Herein, we investigate the energy harvesting device fabricated by the MPB-associated P(VDF-TrFE) copolymer nanofibers through electrospinning.…”

Impact of Thickness and Poling Condition on Dielectric and Piezoelectric Properties of Pb(In0.5Nb0.5)O3–PbTiO3 Ferroelectric Crystals

“…In addition, it has been proved that the sample thickness also have a great influence on the piezoelectric performance of PIN–PMN–PT and PMN–PT crystals using direct current poling (DCP), which is attributed to the degree of difficulty of domain switching. [ 23–25 ] Ultrasonic array transducers based on piezoelectric vibrator have been playing an important role in modern medical ultrasonic imaging systems. [ 2,3 ] The thickness of samples has the determinative effect on their ultimate operation frequencies according to frequency constant N t ( N t = f r × t , f r is the resonance frequency, and t is the thickness).…”