High Frequency Needle Ultrasonic Transducers Based on Lead-Free Co Doped Na0.5Bi4.5Ti4O15 Piezo-Ceramics

Fei, Chunlong; Zhao, Tongtong; Wang, Danfeng; Quan, Yi; Peng, Lin; Li, Di; Yang, Yanchao; Cheng, Jianzheng; Wang, Chunlei; Wang, Chunming; Zhou, Qifa

doi:10.3390/mi9060291

Cited by 17 publications

(7 citation statements)

References 18 publications

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“…Generally speaking, the most commonly used focusing method is spherical pressure focusing (Fei et al, 2018b), which uses a small ball to press a piezoelectric material to a spherical concave surface through a weight (Supplementary Figure S11). This method is simple and the cost is low, but the piezoelectric material in the UHF device is very thin.…”

Section: Press Focusmentioning

confidence: 99%

A Review of UltraHigh Frequency Ultrasonic Transducers

et al. 2022

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The ultrahigh-frequency (UHF) ultrasonic transducers are active in various fields, including nondestructive evaluation in the semiconductor industry, microscopic biological organization imaging in biomedicine, particle manipulation, and so on. In these fields ultrahigh-frequency (UHF) ultrasonic transducers play a critical role in the performance of related equipment. This article will focus on the topic of ultrahigh-frequency ultrasonic transducers’ preparation, and reviews three aspects: material selection, focus design, and acoustic energy transmission matching. Provides a summary of the current research status, and puts forward some views on the future development of UHF ultrasound devices.

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Section: Press Focusmentioning

confidence: 99%

A Review of UltraHigh Frequency Ultrasonic Transducers

et al. 2022

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“…For BNT-based compositions in single-crystal form [41], [42], kt is significantly improved compared to ceramics at similar compositions [27], [43]- [45]. In the 1-3 configuration, good performance with a kt over 70% is specified [42].…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Linear Array (20 MHz) Based on Lead-Free BCTZ Crystal

Bantignies

Rouffaud

Buşe

et al. 2024

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Centimeter-sized BaTiO3-based crystals grown by top-seeded solution growth from the BaTiO3−CaTiO3−BaZrO3 system were used to process a high-frequency (HF) lead-free linear array. Piezoelectric plates with (110)pc cut within 1° accuracy were used to manufacture two 1-3 piezo-composites with thicknesses of 270 and 78 m for resonant frequencies in air of 10 and 30 MHz, respectively. The electromechanical characterization of the BCTZ crystal plates and the 10 MHz piezocomposite yielded thickness coupling factors of 40% and 50%, respectively. We quantified the electromechanical performance of the second piezocomposite (30 MHz) according to the reduction in the pillar sizes during the fabrication process. The dimensions of the piezocomposite at 30 MHz were sufficient for a 128-element array with a 70 m element pitch and a 1.5 mm elevation aperture. The transducer stack (backing, matching layers, lens and electrical components) was tuned with the characteristics of the lead-free materials to deliver optimal bandwidth and sensitivity. The probe was connected to a real-time HF 128channel echographic system for acoustic characterization (electroacoustic response, radiation pattern) and to acquire high-resolution in vivo images of human skin. The center frequency of the experimental probe was 20 MHz, and the fractional bandwidth at -6 dB was 41%. Skin images were compared against those obtained with a lead-based 20-MHz commercial imaging probe. Despite significant differences in sensitivity between elements, in vivo images obtained with a BCTZ-based probe convincingly demonstrated the potential of integrating this piezoelectric material in an imaging probe.

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“…A variety of piezoelectric materials, including piezoelectric ceramics [13,14], ferroelectric polymers [15], and ferroelectrets [16], have been adopted in energy harvesting. Among them, the ferroelectret is a relatively new one that was first used in energy harvesters in 2012 [17].…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Polyethylene Propylene Ferroelectrets with an Air-Filled Concentric Tunnel Structure: Preparation, Characterization, and Application in Energy Harvesting

et al. 2020

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Fluorinated polyethylene propylene (FEP) bipolar ferroelectret films with a specifically designed concentric tunnel structure were prepared by means of rigid-template based thermoplastic molding and contact polarization. The properties of the fabricated films, including the piezoelectric response, mechanical property, and thermal stability, were characterized, and two kinds of energy harvesters based on such ferroelectret films, working in 33- and 31-modes respectively, were investigated. The results show that the FEP films exhibit significant longitudinal and radial piezoelectric activities, as well as superior thermal stability. A quasi-static piezoelectric d33 coefficient of up to 5300 pC/N was achieved for the FEP films, and a radial piezoelectric sensitivity of 40,000 pC/N was obtained in a circular film sample with a diameter of 30 mm. Such films were thermally stable at 120 °C after a reduction of 35%. Two types of vibrational energy harvesters working in 33-mode and 31-mode were subsequently designed. The results show that a power output of up to 1 mW was achieved in an energy harvester working in 33-mode at a resonance frequency of 210 Hz, referring to a seismic mass of 33.4 g and an acceleration of 1 g (g is the gravity of the earth). For a device working in 31-mode, a power output of 15 μW was obtained at a relatively low resonance frequency of 26 Hz and a light seismic mass of 1.9 g. Therefore, such concentric tunnel FEP ferroelectric films provide flexible options for designing vibrational energy harvesters working either in 33-mode or 31-mode to adapt to application environments.

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High Frequency Needle Ultrasonic Transducers Based on Lead-Free Co Doped Na0.5Bi4.5Ti4O15 Piezo-Ceramics

Cited by 17 publications

References 18 publications

A Review of UltraHigh Frequency Ultrasonic Transducers

A Review of UltraHigh Frequency Ultrasonic Transducers

High-Frequency Linear Array (20 MHz) Based on Lead-Free BCTZ Crystal

Fluorinated Polyethylene Propylene Ferroelectrets with an Air-Filled Concentric Tunnel Structure: Preparation, Characterization, and Application in Energy Harvesting

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