Low-Attenuation Acoustic Silicone Lens for Medical Ultrasonic Array Probes

Yamashita, Yohachi; Hosono, Yasuharu; Itsumi, Kazuhiro

doi:10.1007/978-0-387-76540-2_8

Cited by 14 publications

(18 citation statements)

References 8 publications

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“…Recently, it was reported that AC‐poling can enhance both the dielectric and piezoelectric performance for relaxor‐PT crystals 26–33 . Thus, it is expected that the piezoelectric properties for textured ceramics can be enhanced by the AC‐poling.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, many studies have shown that the technique of alternating current electric field poling (AC‐poling) can enhance both the dielectric and piezoelectric performance of relaxor‐PT crystals by 20–50%, when compared to the direct current electric field poling (DC‐poling) 26–33 . Due to the similarity between single crystals and textured ceramics, it is also necessary to investigate the impact of AC‐poling on the dielectric and piezoelectric performances of textured ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Yang

Wang

et al. 2021

J Am Ceram Soc

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Textured piezoelectric ceramics, such as textured Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics, have attracted considerable attention from both academia and industry, as they possess crystal-like piezoelectric properties, high composition homogeneity, and low manufacturing cost. However, the main difficulty with the textured piezoelectric ceramics is the presence of BaTiO 3 (BT) templates, which greatly reduces their piezoelectricity and phase transition temperature. Thus, it is highly recommended to fabricate textured piezoelectric ceramics using as few templates as possible. Here, we successfully fabricated high-quality <001>-textured PMN-28PT ceramics (texturing degree of 99%) by using an extremely small amount of BT templates (1 vol.%) with the help of CuO/B 2 O 3 sintering aids. The textured PMN-28PT ceramic exhibits 80% piezoelectric coefficient (d 33 ∼ 1200 pC/N), 96% electromechanical coefficient (k 33 ∼ 88%) and the same temperature stability (T rt ∼ 100, T c ∼ 150 • C) when compared to its single crystal counterpart. In addition, by using an alternating current electric field poling (AC-poling), the piezoelectric coefficient d 33 and dielectric permittivity ε 33 of the textured PMN-28PT ceramics were further enhanced around 5-8%. It is believed that the advantages of high electromechanical properties, low cost, and easy mass production of textured PMN-28PT ceramic will make it a promising candidate for advanced electromechanical devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Yang

Wang

et al. 2021

J Am Ceram Soc

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“…Typical approaches for piezoelectric materials enhancement include ferroelectric domain engineering, [17][18][19][20] MPB compositional design, [21][22][23] acceptor/donor doping, [24][25] and poling technique. 26 In relaxor single crystals, poling along the principal polarization direction of [001], [110], and [111] in the rhombohedral symmetry induce 4 mm, mm2 and 3m macroscopic ferroelectric domain pattern symmetries that display excellent longitudinal, transverse, and shear responses, respectively. [17][18][19][20] With respect to doping, Samarium-doped PMN-PT 24 has been shown to improve the piezoelectric coefficient to almost twice of undoped PMN-PT by the introduction of local structure heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

“…Third generation Manganese‐doped PIN‐PMN‐PT shows an enhanced coercive field and higher mechanical quality factors than second generation PIN‐PMN‐PT allowing for applications at high power and higher temperatures 25,28,29 . More recently, the alternate current (AC) poling technique has shown up to a 40% increase in piezoelectric coefficient compared with direct current (DC) poling 26 . It has been demonstrated that 71° ferroelectric domain walls are not present, and ferroelectric domain size increases after AC poling 30 .…”

Section: Introductionmentioning

confidence: 99%

“…25,28,29 More recently, the alternate current (AC) poling technique has shown up to a 40% increase in piezoelectric coefficient compared with direct current (DC) poling. 26 It has been demonstrated that 71 • ferroelectric domain walls are not present, and ferroelectric domain size increases after AC poling. 30 In each case, piezoelectric property enhancement is attributed to a flattening of the free energy profile for the corresponding ferroelectric system.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy free energy contribution of the ferroelectric domain dynamics in PMN‐PT and PIN‐PMN‐PT relaxor ferroelectrics

et al. 2023

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A direct correlation between the materials property behavior with its associated ferroelectric domain mechanisms and the anisotropic component of the Landau free energy is established for binary PMN‐PT (generation I) and ternary PIN‐PMN‐PT (generation II) relaxor ferroelectric single crystal material systems. In addition to their trade‐off in material properties, the observed ferroelectric domain dynamic and the determined free energy anisotropies, especially as approaching phase transition, provide direct insights into the materials field‐dependent behavior between the binary and ternary ferroelectric systems. Domain configuration features such as lamellar structures in binary PMN‐PT and concentric oval‐like structures in ternary PIN‐PMN‐PT result in different material responses to external stimuli. Compared to binary PMN‐PT, the concentric oval‐like domain structures of ternary PIN‐PMN‐PT result in a 20°C higher temperature range of field‐dependent linear behavior, 40% increase in coercive electric field EC,${E_C},$ higher elastic stiffness during ferroelectric domain switching, and lower electromechanical energy losses. Separation of the isotropic and anisotropic components in the Landau free energy reveals a higher anisotropic free energy contribution from the ternary system, especially at temperature for practical applications. The high anisotropic free energy found in the ternary PIN‐PMN‐PT system implies that the concentric oval‐like domain structure contributes to reduced electromechanical energy losses and enhanced stability under external applied fields.

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Engineering Domain Variants in 0.7Pb(Mg_1/3Nb_2/3)−0.3PbTiO₃ Single Crystals Using High‐Frequency AC Poling

Zhang,

Li,

Wang

et al. 2024

Small Methods

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Single crystals of (001)‐oriented 0.7Pb(Mg1/3Nb2/3)−0.3PbTiO3 (PMN‐30PT) with a composition near the morphotropic phase boundary have attracted considerable attention due to their superior dielectric and electromechanical performance. Recently, a new alternating current (electric field) poling approach used for the enhancement of dielectric and piezoelectric properties. However, the microscopic domain variants that govern the performance, especially under high‐frequency alternating current (AC) voltages, remain largely unexplored. In this work, the domain microstructure under AC poling reveals the presence of four monoclinic (MA) domain variants using a suite of scanning probe microscopy methods, and X‐ray diffraction (XRD) reciprocal space mapping is tuned. It is reported on the emergence of hierarchical fine domains – needle‐shaped, and 109° domain walls under applied high‐frequency AC poling. Time‐resolved Kelvin probe force microscopy (KPFM) reveals the charge dynamics and relaxation behavior of these needle domains and walls. The findings provide new insight and guidance to the domain engineering by high‐frequency AC poling for the development of advanced transducer technology.

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Low-Attenuation Acoustic Silicone Lens for Medical Ultrasonic Array Probes

Cited by 14 publications

References 8 publications

Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Anisotropy free energy contribution of the ferroelectric domain dynamics in PMN‐PT and PIN‐PMN‐PT relaxor ferroelectrics

Engineering Domain Variants in 0.7Pb(Mg_1/3Nb_2/3)−0.3PbTiO₃ Single Crystals Using High‐Frequency AC Poling

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Low-Attenuation Acoustic Silicone Lens for Medical Ultrasonic Array Probes

Cited by 14 publications

References 8 publications

Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Achieving both high electromechanical properties and temperature stability in textured PMN‐PT ceramics

Anisotropy free energy contribution of the ferroelectric domain dynamics in PMN‐PT and PIN‐PMN‐PT relaxor ferroelectrics

Engineering Domain Variants in 0.7Pb(Mg1/3Nb2/3)−0.3PbTiO3 Single Crystals Using High‐Frequency AC Poling

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Engineering Domain Variants in 0.7Pb(Mg_1/3Nb_2/3)−0.3PbTiO₃ Single Crystals Using High‐Frequency AC Poling