scholarly journals Lead Free Multilayer Piezoelectric Actuators by Economically New Approach

2020 ◽  
Vol 7 ◽  
Author(s):  
Fayaz Hussain ◽  
Amir Khesro ◽  
Zhilun Lu ◽  
Ge Wang ◽  
Dawei Wang
Keyword(s):  
Piezoelectric Actuators ◽  
Lead Free ◽  
New Approach

scholarly journals Hybrid Atmosphere Processing of Lead-Free Piezoelectric Sodium Potassium Niobate-Based Ceramics

Ceramics ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 460-471 ◽  
Author(s):  
Astri Bjørnetun Haugen
Keyword(s):  
Lead Free ◽  
Piezoelectric Response ◽  
Potassium Niobate ◽  
Sodium Potassium ◽  
New Approach ◽  
Sodium Potassium Niobate ◽  
Phase Pure ◽  
High Alkali ◽  
Surface Decomposition ◽  
Air Processing

K0.5Na0.5NbO3-based ceramics, a promising group of lead-free piezoelectrics, are challenging to sinter dense while avoiding alkali evaporation. This work explores hybrid atmosphere processing, a new approach where reducing atmospheres is used during heating to avoid coarsening from alkali carbonates and hydroxides, and oxidizing atmospheres is used during sintering to avoid alkali evaporation. Discs of Li0.06(K0.52Na0.48)0.94Nb0.71Ta0.29O3 with 0.25 mol% Mn (KNNLTM) were sintered in air, N2, 9% H2 in N2, or 9% H2 in N2 during heating and air during sintering (hybrid atmosphere processing). The highest density was obtained by sintering in 9% H2 in N2, but resulted in high alkali loss and decomposition of the surface, followed by low piezoelectric response. However, with the hybrid H2/air processing it was possible to both avoid surface decomposition and leakage currently associated with alkali evaporation during sintering in H2, and to obtain a denser, more phase-pure and small-grained KNNLTM ceramic with a higher piezoelectric response than obtained by sintering in air or N2.

scholarly journals Ultra-high piezoelectric coefficients and strain-sensitive curie temperature in hydrogen-bonded systems

2020 ◽  
Author(s):  
Yangyang Ren ◽  
Menghao Wu ◽  
Jun-Ming Liu
Keyword(s):  
Monte Carlo Simulation ◽  
Curie Temperature ◽  
First Principles ◽  
Tensile Strain ◽  
Room Temperature ◽  
Piezoelectric Coefficient ◽  
Lead Free ◽  
New Approach ◽  
Hydrogen Bonded Systems ◽  
Hydrogen Bonded

Abstract We propose a new approach to obtain ultra-high piezoelectric coefficients that can be infinitely large theoretically, where ferroelectrics with strain-sensitive Curie temperature are necessary. We show the first-principles plus Monte Carlo simulation evidence that many hydrogen-bonded ferroelectrics (e.g. organic PhMDA) can be ideal candidates, which are also flexible and lead-free. Owing to the specific features of hydrogen bonding, their proton hopping barrier will drastically increase with prolonged proton transfer distance, while their hydrogen-bonded network can be easily compressed or stretched due to softness of hydrogen bonds. Their barriers as well as the Curie temperature can be approximately doubled upon a tensile strain as low as 2%. Their Curie temperature can be tuned exactly to room-temperature by fixing a strain in one direction, and in another direction, an unprecedented ultra-high piezoelectric coefficient of 2058 pC/N can be obtained. This value is even underestimated and can be greatly enhanced when applying a smaller strain. Aside from sensors, they can also be utilized for converting either mechanical or thermal energies into electrical energies due to high pyroelectric coefficients.

Preparation of Lead-Free Multi-Layered Piezoelectric Actuator

2006 ◽  
Vol 320 ◽  
pp. 11-14 ◽  
Author(s):  
Tomoaki Futakuchi ◽  
Tatsunori Kakuda ◽  
Yuichi Sakai ◽  
Masatoshi Adachi
Keyword(s):  
Piezoelectric Actuator ◽  
Screen Printing ◽  
Remanent Polarization ◽  
Piezoelectric Properties ◽  
Tape Casting ◽  
Piezoelectric Actuators ◽  
Lead Free ◽  
N2 Atmosphere ◽  
Piezoelectric Layers ◽  
Ferroelectric And Piezoelectric Properties

[BaO]m(Ti0.975Zr0.025)O2 ceramics with Ni electrodes were prepared by a firing in N2 atmosphere. The dielectric, ferroelectric and piezoelectric properties were examined in terms of the composition. The remanent polarization of 9.5μC/cm2 was obtained for m=1.01 by the addition of 0.5wt% SiO2. The longitudinal piezoelectric constant d33 calculated from a unipolar signal (8kV/cm,10Hz) was 430pC/N. Lead-free multi-layered piezoelectric actuators were fabricated using this material by the tape casting, screen-printing of Ni electrodes, laminating under heat and pressure, and firing in N2 atmosphere. The displacement of the actuator with 75μm x 9 active piezoelectric layers was 0.17μm at an applied voltage of 75V and a frequency of 10Hz.

scholarly journals Outstanding Piezoelectricity of (K, Na)(Nb, Sb)O3-SrZrO3-(Bi, Ag)ZrO3 Piezoceramics and Their Application to a Planar-Type Actuator

2021 ◽  
Author(s):  
Su-Hwan Go ◽  
Jae-min Eum ◽  
Dae-Su Kim ◽  
Seok-Jun Chae ◽  
Sun-Woo Kim ◽  
...  
Keyword(s):  
Thick Film ◽  
Domain Boundary ◽  
Boundary Energy ◽  
Piezoelectric Actuators ◽  
Lead Free ◽  
Similar Proportion ◽  
Piezoelectric Charge

Abstract Fe2O3-added 0.96(K0.5Na0.5)(Nb0.94Sb0.06)-0.01SrZrO3-0.03(BiAg)ZrO3 [KNNS-0.01SZ-0.03BAZ] piezoceramic was well densified at 1090 °C. It exhibited a large piezoelectric charge constant (d33) of 650 pC/N, which is similar to the largest d33 value reported in the literature. This sample has a tetragonal-orthorhombic-rhombohedral (T-O-R) structure, in which each structure has a similar proportion. Moreover, nanodomains (2 nm × 15 nm) with low domain boundary energy were found in this sample, which exhibited relaxor properties. Therefore, the presence of a T-O-R multi-structure and nanodomains is responsible for the large d33 value of this sample. A KNNS-0.01SZ-0.03BAZ thick film was synthesized, and it also had a T-O-R multi-structure with a large d33 (630 pC/N). A planar-type actuator was produced using this thick film, and this actuator exhibited a large acceleration (335 G at 120 V/mm) and displacement (231 μm at 120 V/mm). Hence, the KNNS-0.01SZ-0.03BAZ thick film is a good candidate for lead-free piezoelectric actuators.

Shape control of spacecraft antenna reflector using lead-free piezoelectric actuators

2014 ◽  
Vol 23 (5-6) ◽  
pp. 199-216
Author(s):  
C.K. Susheel ◽  
Rajeev Kumar ◽  
Vishal S. Chauhan ◽  
Rahul Vaish
Keyword(s):  
Shape Control ◽  
Piezoelectric Actuators ◽  
Lead Free ◽  
Antenna Reflector

Lead-Free Bismuth-Based Perovskites Coupled with g‒C 3N 4: New Approach Towards Visible Light Pollutants Degradation Designed with Use of Machine Learning

2021 ◽  
Author(s):  
Magdalena Miodyńska ◽  
Alicja Mikolajczyk ◽  
Paweł Mazierski ◽  
Tomasz Klimczuk ◽  
Wojciech Lisowski ◽  
...  
Keyword(s):  
Machine Learning ◽  
Visible Light ◽  
Lead Free ◽  
New Approach

A Spatial 3-DOF Translational Compliant Parallel Manipulator

2010 ◽  
Vol 34-35 ◽  
pp. 143-147 ◽  
Author(s):  
Da Chang Zhu ◽  
Yan Ping Feng
Keyword(s):  
Parallel Manipulator ◽  
Piezoelectric Actuators ◽  
Parallel Manipulators ◽  
Flexure Hinge ◽  
Cartesian Coordinate System ◽  
Optimal Method ◽  
New Approach ◽  
And Topology ◽  
Structure Synthesis ◽  
Cartesian Coordinate

A new approach of structure synthesis of 3-DoF compliant parallel manipulators with flexure hinge is proposed in this paper. Based on characteristics of flexure hinge and topology optimal method, the kinematics of the 3-DOF perpendicular compliant parallel manipulator with flexure hinge and its control system are developed. The parallel manipulator is driven by three piezoelectric actuators and the three actuators in this mechanism are arranged according to the Cartesian coordinate system. Experiments are conducted to give some validation of the theoretical analysis.

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