IEEE Organizations related to Lead-free Piezoelectrics

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Conferences related to Lead-free Piezoelectrics

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2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF)

Ferroelectric materials and applications


2019 IEEE International Ultrasonics Symposium (IUS)

The conference covers all aspects of the technology associated with ultrasound generation and detection and their applications.


2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)

Theory of Piezoelectricity, Bulk and Surface Acoustic Waves, Piezoelectric Materials, Ultrasonic,Manufacturing Technology of Piezoelectric Devices, Oscillators and Filters, Ultrasound Imaging, Frequency Synthesis, MEMS/NEMS



Periodicals related to Lead-free Piezoelectrics

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Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control was the number-three journal in acoustics in 2002, according to the annual Journal Citation Report (2002 edition) published by the Institute for Scientific Information. This publication focuses on the theory, design, and application on generation, transmission, and detection of bulk and surface mechanical waves; fundamental studies in physical acoustics; design of sonic ...



Most published Xplore authors for Lead-free Piezoelectrics

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Xplore Articles related to Lead-free Piezoelectrics

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Electromechanical properties of acceptor-doped lead-free piezoelectrics

2013 Joint IEEE International Symposium on Applications of Ferroelectric and Workshop on Piezoresponse Force Microscopy (ISAF/PFM), 2013

In this paper, the processing and electrocmechanical of Mn-doped BNT-based ceramics prepared by mixed oxide route have been studied. Different amounts of Mn (0.01, 0.014, 0.015, 0.016, 0.017, 0.02, and 0.022) were doped to the 0.88[Bi0.5Na0.5TiO3]-0.08[Bi0.5K0.5TiO3]-0.04[Bi0.5Li0.5TiO3] ceramics. Samples were sintered at different temperatures (1075-1150 °C) to achieve the highest density and mechanical quality factor. Mn-doping resulted in a considerable enhancement ...


(K0.5Na0.5)NbO3 based lead free piezoelectrics with expanded temperature usage range

2008 17th IEEE International Symposium on the Applications of Ferroelectrics, 2008

Lead free materials 0.95(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>-0.05LiSbO<sub>3</sub> modified by CaTiO3 (CT) (1-3wt%) have been synthesized by conventional sintering. All samples exhibited pure perovskite phase with a tetragonal structure at room temperature. The Curie temperature was found to decrease with increasing CT addition in KNN-LS ceramics, while the orthorhombic to tetragaonl polymorphic phase transition was found to shift further downward from room temperature to ...


New opportunity in alkali niobate ceramics processed in low oxygen partial pressure

Proceedings of ISAF-ECAPD-PFM 2012, 2012

Alkali niobate ceramics, such as (Na0.5K0.5)NbO3, has been considered as a promising candidate for lead free piezoelectrics and been a subject of growing interest. We focused on the effects of low oxygen partial pressure (pO2) firing of alkali niobate ceramics, and found that piezoelectric and dielectric properties are essentially independent of the firing atmosphere. Furthermore, low pO2firing provides better electrical ...


Properties of 0.74BiNaTiO<inf>3</inf>-0.06SrTiO<inf>3</inf>/ Bi<inf>0.5</inf>(Na<inf>0.8</inf>K<inf>0.2</inf>)<inf>0.5</inf>TiO<inf>3</inf>ceramic composite

2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF), International Symposium on Integrated Functionalities (ISIF), and Piezoelectric Force Microscopy Workshop (PFM), 2015

We investigated the temperature- and frequency-dependent polarization and strain of two Bismuth-based perovskite composites. A matrix material was chosen as 0.74Bi0.5Na0.5TiO3-0.26SrTiO3(BNT-ST) which have a transition point of 60°C from relaxor to ferroelectric phase (TR-F). An inclusion material was Bi0.5(Na0.8K0.2)0.5TiO3(BNKT) possessing the TR-Fof 120°C. Depending on test temperature, the different polarization and strain behaviors were observed in BN-TST/BNKT composite. At T=25°C, ...


Fabrication of random and textured lead-free (K,Na)NbO<inf>3</inf> in ribbon form

2013 Joint IEEE International Symposium on Applications of Ferroelectric and Workshop on Piezoresponse Force Microscopy (ISAF/PFM), 2013

In this study, random and textured potassium sodium niobate (K,Na)NbO3 ceramics were fabricated in ribbon form through a combination of alginate gelation process and template grain growth methods. Development of crystallographic texture as a result of varying sintering time and temperature was evaluated through rocking curve analysis and a texture with Lotgering factor of 0.86 was achieved. The electrical properties ...


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Educational Resources on Lead-free Piezoelectrics

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IEEE-USA E-Books

  • Electromechanical properties of acceptor-doped lead-free piezoelectrics

    In this paper, the processing and electrocmechanical of Mn-doped BNT-based ceramics prepared by mixed oxide route have been studied. Different amounts of Mn (0.01, 0.014, 0.015, 0.016, 0.017, 0.02, and 0.022) were doped to the 0.88[Bi0.5Na0.5TiO3]-0.08[Bi0.5K0.5TiO3]-0.04[Bi0.5Li0.5TiO3] ceramics. Samples were sintered at different temperatures (1075-1150 °C) to achieve the highest density and mechanical quality factor. Mn-doping resulted in a considerable enhancement of Qmin both planar and thickness vibration modes. In 1.5 mol.% Mn-doped ceramics sintered at 1100 °C, a planar Qmof about 970 and tanδ of 0.88% were obtained. Mn-doping also resulted in decreasing coupling coefficients, piezoelectric charge coefficient, and dielectric constant.

  • (K0.5Na0.5)NbO3 based lead free piezoelectrics with expanded temperature usage range

    Lead free materials 0.95(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>-0.05LiSbO<sub>3</sub> modified by CaTiO3 (CT) (1-3wt%) have been synthesized by conventional sintering. All samples exhibited pure perovskite phase with a tetragonal structure at room temperature. The Curie temperature was found to decrease with increasing CT addition in KNN-LS ceramics, while the orthorhombic to tetragaonl polymorphic phase transition was found to shift further downward from room temperature to lower than -50°C, expanding the temperature usage range. The piezoelectric coefficient d31 and electroemchanical coupling factor k<sub>31</sub> for CT (1wt%) modified KNN-LS materials were found to be on the order of -90pC/N and -28.5% at room temperature, respectively, comparable to those values of pure KNN-LS. Together with its broadened temperature usage range, makes the CT modified materials promising candidates for sensor and transducer applications.

  • New opportunity in alkali niobate ceramics processed in low oxygen partial pressure

    Alkali niobate ceramics, such as (Na0.5K0.5)NbO3, has been considered as a promising candidate for lead free piezoelectrics and been a subject of growing interest. We focused on the effects of low oxygen partial pressure (pO2) firing of alkali niobate ceramics, and found that piezoelectric and dielectric properties are essentially independent of the firing atmosphere. Furthermore, low pO2firing provides better electrical resistivity and microstructure than air firing, which can be explained by the fact that alkali volatilization is suppressed in low pO2firing condition. This opens new opportunities for base meal cofired multilayer applications in the alkali niobate perovskite system. We also found that low pO2fired NaNbO3-NaTaO3solid state ceramic exhibited a much higher resistivity than conventional ferroelectric ceramics such as BaTiO3, and also showed relatively high permittivity at high temperatures up to 250 °C, which make this ceramic promising as a capacitor material for the expanding high temperature.

  • Properties of 0.74BiNaTiO<inf>3</inf>-0.06SrTiO<inf>3</inf>/ Bi<inf>0.5</inf>(Na<inf>0.8</inf>K<inf>0.2</inf>)<inf>0.5</inf>TiO<inf>3</inf>ceramic composite

    We investigated the temperature- and frequency-dependent polarization and strain of two Bismuth-based perovskite composites. A matrix material was chosen as 0.74Bi0.5Na0.5TiO3-0.26SrTiO3(BNT-ST) which have a transition point of 60°C from relaxor to ferroelectric phase (TR-F). An inclusion material was Bi0.5(Na0.8K0.2)0.5TiO3(BNKT) possessing the TR-Fof 120°C. Depending on test temperature, the different polarization and strain behaviors were observed in BN-TST/BNKT composite. At T=25°C, the composite exhibited double-like polarization loop and parabolic strain curves which involve ergodic relaxor- to-normal ferroelectric phase transition with external electric field and the reverse ferroelectric-to relaxor phase transition with removal of the field. When T= 80°C, the BNT-ST/BNKT has very slim polarization and strain of which magnitude are slightly increased values from pure BNT-BT. When T= 120°C, both composites have slim polarization and strain behaviors of which values are almost same as the pure BNT-ST. These high field-induced polarization and strain with respect to temperature for the composites are related to the thermal stability of ferroelectric inclusions, and their nucleation and growth in relaxor matrix.

  • Fabrication of random and textured lead-free (K,Na)NbO<inf>3</inf> in ribbon form

    In this study, random and textured potassium sodium niobate (K,Na)NbO3 ceramics were fabricated in ribbon form through a combination of alginate gelation process and template grain growth methods. Development of crystallographic texture as a result of varying sintering time and temperature was evaluated through rocking curve analysis and a texture with Lotgering factor of 0.86 was achieved. The electrical properties of textured ribbons were evaluated with polarization and strain vs. electric field measurements.

  • Compressive type accelerometer made by leadfree Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf>- based piezoceramics

    Compressive type accelerometers are widely used in various vibration measurements. Lead-free piezoelectric ceramics as sensitive element have been preferred from the viewpoint of environmental impact. In this paper, 0.30 wt% MnO-added Bi0.485Na0.425K0.06Ba0.03TiO3(BNKB) piezoelectric ceramics were used as the sensitive element in a compressive type accelerometer. Based on the finite element analysis, the influences of the mass of the preloading element and the thickness of the sensitive piezo-rings on charge sensitivity and operation frequency were analyzed, thus optimizing the structure and parameters of the accelerator. The sensitivity (calibrated by a back-to-back method) of the accelerometer as-fabricated was measured to be 3.9 pC/m·s-2within 100 Hz-5 kHz within the 2dB tolerance.

  • Stress-modified phase transitions in polarized PMN-PIN-PT, KN and KNL-NTS single crystals/textured ceramics: Thermal expansion and Raman scattering studies

    Piezoelectric PMN-PIN-PT as well as lead-free KN and KNL-NST analogues in the form of single crystals or textured ceramics were investigated as a function of temperature and/or applied stress using Raman spectroscopy and dilatometry. The results reveal: 1) the 1storder character of the 120°C-transition in PMN- PIN-PT; 2) a previously unreported stress dependent phase transition in KN at 70°C; 3) important structural and dielectric changes in the case of KNL-NST ceramics in comparison with KN.

  • Fabrication and piezoelectric properties of (K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-based ceramics doped with Bi-perovskites

    The effect of the addition of Bi-perovskites to (Li0.04K0.52Na0.44)(Nb0.84Ta0.1Sb0.06)O3 (LF4) ceramics was studied to improve the properties of lead-free piezoelectrics. Ceramics with the relative density above 96% were successfully obtained by a solid state reaction process. The changes in lattice parameters indicated that the vacancy concentration at the A-site of the perovskite structure and the tetragonality of the crystal lattice were reduced with the addition of BiFeO3. The addition of BiFeO3 changed the LF4 to a soft-piezoelectric. The electrical insulation of the LF4 was improved with the addition of BiFeO3, which made a full poling possible under high electric fields. A few mol% of BiFeO3 was effective to improve the remanent polarization of the LF4 ceramics and a piezoelectric d33 constant of about 358 pm/V was obtained in the 0.4 mol% doped ceramics.

  • Stress and temperature driven phase transitions in single crystalline KNbO<inf>3</inf>and textured KNL-NTS ceramics: A Raman andthermal expansion study

    Lead-free KNbO3single crystals and (K0.38Na0.52Li0.04)-(Nb0.86Ta0.1Sb0.04)O2.97textured ceramics were investigated as a function of temperature using Raman spectroscopy and loading dilatometry.

  • Anisotropy and dynamic thermal depolarization of 0.96(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf>-0.04 BaTiO<inf>3</inf>lead-free piezoceramics

    Undoped (Bi0.5Na0.5)0.96Ba0.04TiO3ceramics were prepared from mixed oxides and sol-gel autocombustion powder. Similar dielectric and electromechanical properties were found for both but sol-gel derived ceramics can be obtained with a lower thermal budget, which prevent losses of volatiles. Dielectric anisotropy is observed. All the features of the thermal evolution curves of εT11are observed at temperatures clearly displaced towards higher values with respect to those of the εT33curves. There is also anisotropy in the depoling process. When depoling is monitored in-situ using the shear mode of thickness poled plates, resonance is observed at Td>; 150°C. Besides, hot in-situ measurements of time dependence of the resonaces of disks and plates at temperatures below Tdshowed that the depolarization of BNBT4 is a dynamical process.



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