High Performance Relaxor-Based Ferroelectric Single Crystals for Ultrasonic Transducer Applications

Yan, Chen‐Hua; Lam, Kwok Ho; Zhou, Dan; Wang, Hao; Yu, Yanxiong; Wu, Jinchuan; Qiu, Weibao; Sun, Lei; Zhang, Chao; Luo, Haosu; Chan, Helen Lai Wa

doi:10.3390/s140813730

Cited by 76 publications

(24 citation statements)

References 73 publications

(89 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second generation crystals extend the high electromechanical properties to a broader range of temperature, electric field and mechanical stress, expanding their design envelope by reducing the need for heat shunts and applied dc fields. Crystals with higher ferroelectric phase transition temperatures and higher coercive fields are in this category [141,153,275,278], where the potential commercialization of the ternary PIN-PMN-PT and PMN-PZT is expected. Third generation crystals include the addition of small amount of dopants to tailor the crystal’s electromechanical parameters in order to meet specific device requirements.…”

Section: The Development Of Relaxor-pt Single Crystalsmentioning

confidence: 99%

“…4 shows a Relaxor-PT single crystal boule grown by the Bridgman method, which can be separated into three different composition phases, including R phase, O/M (monoclinic) phase and T phase along the growth direction, due to the large segregation coefficient of Ti 4+ [153,187,207]. It was observed that the crystals exhibit 4mm macroscopic symmetry when the crystals were poled along [001] directions, with engineered domain configurations 4R and 4O in R and O phase crystals respectively, while single domain state 1T is presented in T phase crystals.…”

Section: The Development Of Relaxor-pt Single Crystalsmentioning

confidence: 99%

See 1 more Smart Citation

Advantages and challenges of relaxor-PbTiO3 ferroelectric crystals for electroacoustic transducers – A review

Zhang

Jiang

et al. 2015

Progress in Materials Science

676

339

View full text Add to dashboard Cite

Relaxor-PbTiO3 (PT) based ferroelectric crystals with the perovskite structure have been investigated over the last few decades due to their ultrahigh piezoelectric coefficients (d33 > 1500 pC/N) and electromechanical coupling factors (k33 > 90%), far outperforming state-of-the-art ferroelectric polycrystalline Pb(Zr,Ti)O3 ceramics, and are at the forefront of advanced electroacoustic applications. In this review, the performance merits of relaxor-PT crystals in various electroacoustic devices are presented from a piezoelectric material viewpoint. Opportunities come from not only the ultrahigh properties, specifically coupling and piezoelectric coefficients, but through novel vibration modes and crystallographic/domain engineering. Figure of merits (FOMs) of crystals with various compositions and phases were established for various applications, including medical ultrasonic transducers, underwater transducers, acoustic sensors and tweezers. For each device application, recent developments in relaxor-PT ferroelectric crystals were surveyed and compared with state-of-the-art polycrystalline piezoelectrics, with an emphasis on their strong anisotropic features and crystallographic uniqueness, including engineered domain - property relationships. This review starts with an introduction on electroacoustic transducers and the history of piezoelectric materials. The development of the high performance relaxor-PT single crystals, with a focus on their uniqueness in transducer applications, is then discussed. In the third part, various FOMs of piezoelectric materials for a wide range of ultrasound applications, including diagnostic ultrasound, therapeutic ultrasound, underwater acoustic and passive sensors, tactile sensors and acoustic tweezers, are evaluated to provide a thorough understanding of the materials’ behavior under operational conditions. Structure-property-performance relationships are then established. Finally, the impacts and challenges of relaxor-PT crystals are summarized to guide on-going and future research in the development of relaxor-PT crystals for the next generation electroacoustic transducers.

show abstract

Section: The Development Of Relaxor-pt Single Crystalsmentioning

confidence: 99%

Section: The Development Of Relaxor-pt Single Crystalsmentioning

confidence: 99%

Advantages and challenges of relaxor-PbTiO3 ferroelectric crystals for electroacoustic transducers – A review

Zhang

Jiang

et al. 2015

Progress in Materials Science

676

339

View full text Add to dashboard Cite

show abstract

“…A number of authors have estimated the elastic parameters of cylindrical sample using the first break travel time and phase velocity methods (Simons, 1987;Vernik, 1994;Lee and Waite, 2009;Chen et. al., 2014;Shragge, J. et.…”

Section: Introductionmentioning

confidence: 99%

Forward and inversion modelling of the ultrasonic wave in a homogeneous medium using P-wave transducers

Nzikou¹,

Yurikov²,

Madadi³

et al. 2018

ASEG Extended Abstracts

View full text Add to dashboard Cite

SUMMARYWe use full wave forward and inversion modelling to estimate the elastic properties of rock samples from ultrasonic waveforms. The finite element algorithm (ABAQUS modelling software) is used to model a forward wave propagation within a homogeneous medium. For 19 mm diameter P-wave transducers, the result of the displacement waveform for a uniform source signal is obtained using both a linear and radial (about 2 mm) receiver arrays. Also, the use of a non-uniform source amplitude such as Gaussian distribution improves the displacement waveforms by few percent. The results accuracy is increased with increasing values of Gaussian standard deviation. However, for a nominal frequency of 1MHz, the same error increases with the decreasing frequencies. Additionally, our inversion algorithm (written in Python) searches for the best Young modulus (E) and Poison ratio (ν) of the medium iteratively. Finally, without prior knowledge of any threshold, the elastic parameters are estimated, and the results are consistent with the experimental measurements. These results provide a new modelling workflow to estimate the elastic parameters of the homogeneous and isotropic sample.

show abstract

“…Piezocrystals are now used widely in biomedical ultrasound imaging and investigation of their possibilities is under way in nondestructive evaluation, particle manipulation and underwater sonar [7][8][9][10] based on piezoelectric properties including k 33 ≈ 90% and d 33 > 1500 pC/N [11]. Bulk, monolithic piezocrystal has little advantage over piezoceramic, with the values of k t being similar, but improved performance can be realized in configurations such as the planks used in biomedical imaging arrays and the pillars used in piezocomposites.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a PMN-PT piezocrystal-based focused array with geodesic faceted structure

Qiu

Démoré

et al. 2016

Ultrasonics

View full text Add to dashboard Cite

Abstract-The higher performance of relaxor-based piezocrystals compared with piezoceramics is now well established, notably including improved gain-bandwidth product, and these materials have been adopted widely for biomedical ultrasound imaging. However, their use in other applications, for example as a source of focused ultrasound for targeted drug delivery, is hindered in several ways. One of the issues, which we consider here, is in shaping the material into the spherical geometries used widely in focused ultrasound.Unlike isotropic unpoled piezoceramics that can be shaped into a monolithic bowl then poled through the thickness, the anisotropic structure of piezocrystals make it impossible to machine the bulk crystalline material into a bowl without sacrificing performance. Instead, we report a novel faceted array, inspired by the geodesic dome structure in architecture, which utilizes flat piezocrystal material and maximizes fill factor.Aided by 3D printing, a prototype with f#  1.2, containing 96 individually addressable elements was manufactured using 1-3 connectivity PMN-PT piezocrystal -epoxy composite. The fabrication process is presented and the array was connected to a 32-channel controller to shape and steer the beam for preliminary performance demonstration. At an operating frequency of 1 MHz, a focusing gain around 30 was achieved and the side lobe intensities were all at levels below -12 dB compared to main beam. We conclude that, by taking advantage of contemporary fabrication techniques and driving instrumentation, the geodesic array configuration is suitable for focused ultrasound devices made with piezocrystal.

show abstract

High Performance Relaxor-Based Ferroelectric Single Crystals for Ultrasonic Transducer Applications

Cited by 76 publications

References 73 publications

Advantages and challenges of relaxor-PbTiO3 ferroelectric crystals for electroacoustic transducers – A review

Advantages and challenges of relaxor-PbTiO3 ferroelectric crystals for electroacoustic transducers – A review

Forward and inversion modelling of the ultrasonic wave in a homogeneous medium using P-wave transducers

Implementation of a PMN-PT piezocrystal-based focused array with geodesic faceted structure

Contact Info

Product

Resources

About