Complete electroelastic set of co doped barium titanate for transducer applications

Ul, Rémy; Rouffaud, Rémi; Tran-Huu-Hue, Louis-Pascal; Levassort, Franck; Pham‐Thi, M.; Bantignies, Claire

doi:10.1109/ultsym.2017.8092203

Cited by 2 publications

(2 citation statements)

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“…The functional properties of the characterized BCTZ crystal plate with dimensions of 30.17.50.59 mm 3 are summarized in Table I (column "plate"). A kt value of approximately 43% falls in the same range as those of other BT-based compositions (ceramics) [49].…”

Section: B Materials Characterizationmentioning

confidence: 55%

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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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Section: B Materials Characterizationmentioning

confidence: 55%

“…Here, for the 1-3 piezocomposite (ceramic-based), acoustic impedance decreases with the use of polymer, which is expected. However, kt is not significantly improved in this family, mainly due to the limited values of k33 [49], [50].…”

Section: Introductionmentioning

confidence: 85%