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Artykuły w czasopismach na temat „Piezoelectric”

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Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 7 września 2023

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1

WAN, YONGPING, i LIANGLIANG FAN. "MODELING THE PIEZOELECTRIC d33 COEFFICIENT OF THE CELLULAR PIEZOELECTRET FILM BY FINITE ELEMENT METHOD". Modern Physics Letters B 25, nr 31 (21.11.2011): 2343–51. http://dx.doi.org/10.1142/s0217984911027558.

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The piezoelectric d33 coefficient of voided charged polypropylene film is much pronounced, which can be as large as that of PZT ceramics. The piezoelectric effect originates from the electric field of distributed charges that is coupled with elastic deformation of the host matrix. For modeling the piezoelectric effect of cellular piezoelectret, we present a finite element model for the electrostatic analysis and the solution of elastic deformation. Qualitative analysis of piezoelectric d33 coefficient is given with respect to various parameters including material constants, void geometry and charge density. Quantitative comparison shows that this finite element model can simulate the inflation experiments of cellular piezoelectret very well. This finite element model is believed to be conducive to the optimization design of cellular piezoelectret, where the analysis is generally encountered for the piezoelectret with complex microstructures.
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2

Zhang, He Bin, Zhong Hua Zhang, Ya Ding Jin, Hui Lun Jiang, Lin Jun Fan i Xue Cai Yu. "Experimental Study on Tertiary Piezoelectric Effect of X-Cut Quartz Crystal". Key Engineering Materials 620 (sierpień 2014): 134–39. http://dx.doi.org/10.4028/www.scientific.net/kem.620.134.

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This Paper has analyzed the relationship between the generation of multiple piezoelectric effects and boundary conditions of piezoelectrics and the experiments have studied tertiary piezoelectric effect of piezoelectric quartz which is applied extensively in engineering practice. We processed our experiment by piezoelectric quartz crystal unit made by two pieces of X-cut piezoelectric quartz, parallel connected it to a capacitor with the equivalent capacitance of about 1,000 times of that of piezoelectric quartz crystal unit and then got the result of pure primary piezoelectric effect excluding tertiary induced effect; then compared it with conventional primary piezoelectric effect and concluded that tertiary piezoelectric effect of piezoelectric quartz is about 1.7% of primary piezoelectric effect; thus quantified longitudinally tertiary piezoelectric effect of piezoelectric quartz crystal, concluded that piezoelectric coefficient of tertiary effect of X-cut piezoelectric quartz is about 0.04 pC/N by experiment and got relative uncertainty and standard uncertainty of the results by such experiment methods respectively as 9.49×10-3and 1.37×10-2. This study on tertiary piezoelectric effect has provided a new approach for improving precision and sensitivity of piezoelectric sensors.
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3

Zhang, Zhong Hua, Guang Ming Cheng, Jun Wu Kan, Ping Zeng i Jian Ming Wen. "The Influence of Multiple Piezoelectric Effects on Elastic Coefficient of Piezoelectric Ceramics". Advanced Materials Research 305 (lipiec 2011): 348–52. http://dx.doi.org/10.4028/www.scientific.net/amr.305.348.

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The development of new materials and the performance improvement of existing materials become an important subject from different aspects. In this paper, based on the theoretical research results of multiple piezoelectric effects, the influence of multiple piezoelectric effects on elastic coefficient of piezoelectric ceramics is studied. Theoretical analysis indicates that it is multiple piezoelectric effects that make piezoelectrics have two kinds of elastic and they result in the decrease of elastic compliance coefficients. Experimental validation is performed through PZT-5. Experimental results show that elastic compliance coefficient grows decreased by 0.912 times.
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4

Zengtao Yang i Jiashi Yang. "Connected Vibrating Piezoelectric Bimorph Beams as a Wide-band Piezoelectric Power Harvester". Journal of Intelligent Material Systems and Structures 20, nr 5 (28.11.2008): 569–74. http://dx.doi.org/10.1177/1045389x08100042.

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We analyze coupled flexural vibration of two elastically and electrically connected piezoelectric beams near resonance for converting mechanical vibration energy to electrical energy. Each beam is a so-called piezoelectric bimorph with two layers of piezoelectrics. The 1D equations for bending of piezoelectric beams are used for a theoretical analysis. An exact analytical solution to the beam equations is obtained. Numerical results based on the solution show that the two resonances of individual beams can be tuned as close as desired by design when they are connected to yield a wide-band electrical output. Therefore, the structure can be used as a wide-band piezoelectric power harvester.
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5

Park, D. S., M. Hadad, L. M. Riemer, R. Ignatans, D. Spirito, V. Esposito, V. Tileli i in. "Induced giant piezoelectricity in centrosymmetric oxides". Science 375, nr 6581 (11.02.2022): 653–57. http://dx.doi.org/10.1126/science.abm7497.

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Piezoelectrics are materials that linearly deform in response to an applied electric field. As a fundamental prerequisite, piezoelectric materials must have a noncentrosymmetric crystal structure. For more than a century, this has remained a major obstacle for finding piezoelectric materials. We circumvented this limitation by breaking the crystallographic symmetry and inducing large and sustainable piezoelectric effects in centrosymmetric materials by the electric field–induced rearrangement of oxygen vacancies. Our results show the generation of extraordinarily large piezoelectric responses [with piezoelectric strain coefficients ( d 33 ) of ~200,000 picometers per volt at millihertz frequencies] in cubic fluorite gadolinium-doped CeO 2− x films, which are two orders of magnitude larger than the responses observed in the presently best-known lead-based piezoelectric relaxor–ferroelectric oxide at kilohertz frequencies. These findings provide opportunities to design piezoelectric materials from environmentally friendly centrosymmetric ones.
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6

Uchino, Kenji. "Piezoelectric Devices in the Sustainable Society". Sustainability in Environment 4, nr 4 (11.09.2019): p181. http://dx.doi.org/10.22158/se.v4n4p181.

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Our 21st century faces to a “sustainable society”, which enhances (a) usage of non-toxic materials, (b) disposal technology for existing hazardous materials, (c) reduction of contamination gas, (d) environmental monitoring system, (e) new energy source creation, and (f) energy-efficient device development in the piezoelectric area. With reducing their size, the electromagnetic components reduce their efficiency drastically. Thus, piezoelectric transducers with much less losses are highly sought recently. Piezoelectric devices seem to be all-around contributors and a key component to the above mentioned five R&D areas. Some of the efforts include: (a) Since the most popular piezoelectric lead zirconate titante ceramics will be regulated in European and Asian societies due to their toxicity (Pb2+ ion), lead-free piezoelectrics have been developed. (b) Since hazardous organic substances can easily be dissolved by the ultrasonic irradiation in water, a new safe disposal technology using piezoelectric transducers has been developed. (c) We demonstrated an energy recovery system on a hybrid car from its engine’s mechanical vibration to the rechargeable battery. (d) Micro ultrasonic motors based on piezoelectrics demonstrated 1/20 reduction in the volume and a 20-time increase in efficiency of the conventional electromagnetic motors. This paper introduces leading piezoelectric materials, devices, and drive/control methods, relating with the above “sustainability” technologies, aiming at further research expansion in this area.
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7

CHEN, YU, YUMEI WEN i PING LI. "CHARACTERIZATIONS OF DISSIPATION FACTORS IN PIEZOELECTRIC CERAMIC DISCS UNDER STRESS AND TEMPERATURE". International Journal of Information Acquisition 01, nr 04 (grudzień 2004): 327–35. http://dx.doi.org/10.1142/s0219878904000306.

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Losses in piezoelectrics are considered in general consisting of three different parts: Dielectric, elastic and piezoelectric losses. A method to analyze losses in piezoelectrics uses three dissipation factors to represent the corresponding losses by introducing complex coefficients into Mason's equivalent electric circuit. We establish a model of a piezoelectric ceramic disc utilizing the method mentioned above, and then the relationships between the complex coefficients and the equivalent circuit parameters are obtained. Derived from the piezoelectric equations with complex coefficients, the dissipation factors are related to the equivalent circuit parameters. The experiments give the effects of the temperature and the stress applied on the piezoelectric ceramic disc separately. It is shown that three dissipation factors exhibit different responses to the stress and temperature. Based on the theory of lattice phase and the theory that losses are considered to consist of four portions: Domain wall motion; fundamental lattice portion; microstructure portion and conductivity portion, the phenomenology of losses variations with the temperature and stress is explained.
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8

Wang, Hui, Xiaolin Wang, Matthew Wadsworth, Mohammad Faisal Ahmed, Zhe Liu i Changchun Zeng. "Design, Fabrication, Structure Optimization and Pressure Sensing Demonstration of COC Piezoelectret Sensor and Sensor Array". Micromachines 13, nr 8 (26.07.2022): 1177. http://dx.doi.org/10.3390/mi13081177.

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This study reported on the design and fabrication of a pseudo-piezoelectric material (piezoelectret) from cyclic olefin copolymer (COC) based on a micropillar structure. The fabrication feasibility of such structure was explored and piezoelectret with the good piezoelectric activity (characterized by quasi-static piezoelectric coefficient d33) was demonstrated. Response surface method with a central composite design was employed to investigate the effects of the structure parameter on the piezoelectric coefficient d33. An optimal structure design was obtained and was validated by experiments. With the optimal design, d33 can reach an exceptional high value of ~9000 pC/N under low pressure. The charging process and the electrical and electromechanical characteristics were further investigated by experimentation and modeling. We further demonstrated the scalability of the fabrication process and demonstrated the application of these sensors in position specific pressure sensing (pressure mapping).
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9

DAMJANOVIC, DRAGAN, NAAMA KLEIN, JIN LI i VIKTOR POROKHONSKYY. "WHAT CAN BE EXPECTED FROM LEAD-FREE PIEZOELECTRIC MATERIALS?" Functional Materials Letters 03, nr 01 (marzec 2010): 5–13. http://dx.doi.org/10.1142/s1793604710000919.

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The reasons for the lower piezoelectric properties in the most studied lead-free piezoelectrics, modified (K, Na)NbO 3 and ( Bi 0.5 Na 0.5) TiO 3, are discussed. Contributions from domain wall motion and properties at the morphotropic phase boundary are considered and are compared to those in PZT. Lead-free, non-piezoelectric solutions to electromechanical coupling are discussed.
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10

Liu, Qing, Yichi Zhang, Jing Gao, Zhen Zhou, Hui Wang, Ke Wang, Xiaowen Zhang, Longtu Li i Jing-Feng Li. "High-performance lead-free piezoelectrics with local structural heterogeneity". Energy & Environmental Science 11, nr 12 (2018): 3531–39. http://dx.doi.org/10.1039/c8ee02758g.

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11

Mohammadi, S., i M. Abdalbeigi. "Analytical Optimization of Piezoelectric Circular Diaphragm Generator". Advances in Materials Science and Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/620231.

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This paper presents an analytical study of the piezoelectric circular diaphragm microgenerator using strain energy method. Piezoelectrics are the intelligent materials that can be used as transducer to convert mechanical energy into electrical energy and vice versa. The aim of this paper is to optimize produced electrical energy from mechanical pressure. Therefore, the circular metal plate equipped with piezoelectric circular patch has been considered with simply and clamped supports. A comprehensive modeling, parametrical study and the effect of the boundary conditions on the performance of the microgenerator have been investigated. The system is under variable pressure from an oscillating pressure source. Results are presented for PZT and PMN-PT piezoelectric materials with steel and aluminum substrates. An optimal value for the radius and thickness of the piezoelectric layer with a special support condition has been obtained.
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12

Shinekumar, K., i Soma Dutta. "High-Temperature Piezoelectrics with Large Piezoelectric Coefficients". Journal of Electronic Materials 44, nr 2 (4.12.2014): 613–22. http://dx.doi.org/10.1007/s11664-014-3534-2.

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13

Huangfu, Geng, Kun Zeng, Binquan Wang, Jie Wang, Zhengqian Fu, Fangfang Xu, Shujun Zhang, Haosu Luo, Dwight Viehland i Yiping Guo. "Giant electric field–induced strain in lead-free piezoceramics". Science 378, nr 6624 (9.12.2022): 1125–30. http://dx.doi.org/10.1126/science.ade2964.

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Piezoelectric actuators are indispensable over a wide range of industries for their fast response and precise displacement. Most commercial piezoelectric actuators contain lead, posing environmental challenges. We show that a giant strain (1.05%) and a large-signal piezoelectric strain coefficient (2100 picometer/volt) are achieved in strontium (Sr)–doped (K,Na)NbO 3 lead-free piezoceramics, being synthesized by the conventional solid-state reaction method without any post treatment. The underlying mechanism responsible for the ultrahigh electrostrain is the interaction between defect dipoles and domain switching. The fatigue resistance, thermal stability, and strain value (0.25%) at 20 kilovolt/centimeter are comparable with or better than those of commercial Pb(Zr,Ti)O 3 -based ceramics, showing great potential for practical applications. This material may provide a lead-free alternative with a simple composition for piezoelectric actuators and a paradigm for the design of high-performance piezoelectrics.
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14

Chen, Shaobo, Xiangrong Chen, Zhaoyi Zeng, Huayun Geng i Huabing Yin. "The coexistence of superior intrinsic piezoelectricity and thermoelectricity in two-dimensional Janus α-TeSSe". Physical Chemistry Chemical Physics 23, nr 47 (2021): 26955–66. http://dx.doi.org/10.1039/d1cp04749c.

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A new group-VI Janus ternary compounds α-TeSSe monolayer exhibits outstanding piezoelectric and thermoelectric performances, which has broad application prospects in the fields of piezoelectrics and thermoelectrics.
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15

Meng, Yanfang, Genqiang Chen i Maoyong Huang. "Piezoelectric Materials: Properties, Advancements, and Design Strategies for High-Temperature Applications". Nanomaterials 12, nr 7 (1.04.2022): 1171. http://dx.doi.org/10.3390/nano12071171.

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Piezoelectronics, as an efficient approach for energy conversion and sensing, have a far-reaching influence on energy harvesting, precise instruments, sensing, health monitoring and so on. A majority of the previous works on piezoelectronics concentrated on the materials that are applied at close to room temperatures. However, there is inadequate research on the materials for high-temperature piezoelectric applications, yet they also have important applications in the critical equipment of aeroengines and nuclear reactors in harsh and high-temperature conditions. In this review, we briefly introduce fundamental knowledge about the piezoelectric effect, and emphatically elucidate high-temperature piezoelectrics, involving: the typical piezoelectric materials operated in high temperatures, and the applications, limiting factors, prospects and challenges of piezoelectricity at high temperatures.
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16

Soedarto, Totok, i Taufiq Arif Setyanto. "Perancangan Signal Conditioning Untuk Sensor Piezoelectric". Wave: Jurnal Ilmiah Teknologi Maritim 6, nr 1 (24.01.2019): 13–20. http://dx.doi.org/10.29122/jurnalwave.v6i1.3320.

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Perancangan rangkaian interface atau signal conditioning untuk optimasi penggunaan sensor berbasis material piezoelectric mempunyai peranan sangat penting. Karena aplikasi-aplikasi dari material piezoelectrik sangatlah luas, mulai dari hal-hal yang menyangkut mainan anak-anak sampai dengan keperluan uji laboratorium bahkan sensor-sensor militer dan interfacing terhadap rangkaian elektronik sangatlah bergantung pada aplikasinya. Dalam banyak hal, material piezoelectric dapat secara langsung dihubungkan pada rangkaian elektronik tanpa pertimbangan memerlukan interface khusus. Namun demikian, untuk hal-hal tertentu masih dibutuhkan sebuah rangkaian interface, ada beberapa langkah yang harus dipertimbangkan dalam perancangan interface yang menyangkut topologi yang paling sesuai untuk aplikasi yang dibutuhkan. Pada makalah ini hanya dibahas tentang perancangan dan pembuatan signal conditioning untuk keperluan pengujian di lab Hidrodinamika.
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17

Wang, Aochen, Ming Hu, Liwei Zhou i Xiaoyong Qiang. "Self-Powered Wearable Pressure Sensors with Enhanced Piezoelectric Properties of Aligned P(VDF-TrFE)/MWCNT Composites for Monitoring Human Physiological and Muscle Motion Signs". Nanomaterials 8, nr 12 (7.12.2018): 1021. http://dx.doi.org/10.3390/nano8121021.

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Self-powered operation, flexibility, excellent mechanical properties, and ultra-high sensitivity are highly desired properties for pressure sensors in human health monitoring and anthropomorphic robotic systems. Piezoelectric pressure sensors, with enhanced electromechanical performance to effectively distinguish multiple mechanical stimuli (including pressing, stretching, bending, and twisting), have attracted interest to precisely acquire the weak signals of the human body. In this work, we prepared a poly(vinylidene fluoride-trifluoroethylene)/ multi-walled carbon nanotube (P(VDF-TrFE)/MWCNT) composite by an electrospinning process and stretched it to achieve alignment of the polymer chains. The composite membrane demonstrated excellent piezoelectricy, favorable mechanical strength, and high sensitivity. The piezoelectric coefficient d33 value was approximately 50 pm/V, the Young’s modulus was ~0.986 GPa, and the sensitivity was ~540 mV/N. The resulting composite membrane was employed as a piezoelectric pressure sensor to monitor small physiological signals including pulse, breath, and small motions of muscle and joints such as swallowing, chewing, and finger and wrist movements. Moderate doping with carbon nanotubes had a positive impact on the formation of the β phase of the piezoelectric device, and the piezoelectric pressure sensor has the potential for application in health care systems and smart wearable devices.
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18

Tyunina, Marina, Jan Miksovsky, Tomas Kocourek i Alexandr Dejneka. "Hysteresis-Free Piezoresponse in Thermally Strained Ferroelectric Barium Titanate Films". Electronic Materials 2, nr 1 (14.01.2021): 17–23. http://dx.doi.org/10.3390/electronicmat2010002.

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Modern technology asks for thin films of sustainable piezoelectrics, whereas electro-mechanical properties of such films are poorly explored and controlled. Here, dynamic and quasi-static polarization, dielectric, and piezoelectric responses were experimentally studied in thin-film stacks of barium titanate sandwiched between electrodes and grown on top of strontium titanate substrate. Accurate piezoelectric characterization was secured by using double beam interferometric technique. All out-of-plane responses were found to be hysteresis-free. Effective piezoelectric coefficient ~50 pm/V and linear strain-voltage characteristic were achieved. The observed behavior was ascribed to field induced out-of-plane polarization, whereas spontaneous polarization is in-plane due to in-plane tensile thermal strain. Hysteresis-free linear piezoresponse was anticipated in thin films on commercial silicon substrates, enabling large thermal strain.
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19

Yang, Hao, Jinyan Zhao, Wei Ren, Zuo-Guang Ye, K. B. Vinayakumar, Rosana A. Dias, Rui M. R. Pinto, Jian Zhuang i Nan Zhang. "Lead free 0.9Na1/2Bi1/2TiO3–0.1BaZr0.2Ti0.8O3 thin film with large piezoelectric electrostrain". Applied Physics Letters 121, nr 13 (26.09.2022): 132903. http://dx.doi.org/10.1063/5.0106934.

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A sodium bismuth titanate-based thin film is widely investigated lead-free piezoelectrics with potential applications for modern micro-devices such as PiezoMEMS. In this work, a 0.9Na1/2Bi1/2TiO3–0.1BaZr0.2Ti0.8O3 thin film was deposited on a Pt/Ti/SiO2/Si (001) substrate by the sol–gel spin coating method. The deposited piezoelectric film shows low dielectric loss and high remnant polarization. The measured ferroelectricity loop showed a coercive field of 110 kV/cm and a saturation polarization of 46.83 μC/cm2. The piezoelectric response of this thin film does not decrease from room temperature to around 100 °C. The fabricated piezoelectric device with bottom and top electrodes showed a large macro-scale strain value of ∼4% under the DC (30 V) and AC voltages (f = 800 kHz, Vpp = 10 V).
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20

Hu, Wei, Xin Wei i Xiao Zhu Xie. "Modeling and Simulation of Micro Hydraulic Transducer Based on Component Library". Advanced Materials Research 505 (kwiecień 2012): 106–11. http://dx.doi.org/10.4028/www.scientific.net/amr.505.106.

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For MHT is an integrated system for different domains, namely fluids, structures, piezoelectrics and circuitry, a component library consisting of inlets, outlets, chambers and piezoelectric blocks is developed with Modelica. The governing equations of inlet and outlet channels, chamber and piezoelectric block are proposed and parameter models are created based on object-oriented method with Modelica. Then the model of MHT is established by connecting different components’ pins of equivalent type. Simulation results on Dymola show accordance with that on Simulink, which indicates that this method can achieve high efficiency and precision.
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21

Ye, Zhe Yu, i Zhi Yong Wang. "Piezoelectrics-Based Integrated Optical Waveguide for Mach-Zehnder Interferometer as the Modulator in Microwave Photonic Link". Advanced Materials Research 421 (grudzień 2011): 31–34. http://dx.doi.org/10.4028/www.scientific.net/amr.421.31.

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Microwave photonic link (MPL), which processes microwave signal with photonic technologies, has offered many advantages such as increased channel capacity, immunity to RF disturbance, reduction of size and weight, and low loss. External modulation of the MPL applies Mach-Zehnder interferometer (MZI) for the modulating. The traditional phase transitional behavior of the EO device lacks the performances required for quick response, low half-wave voltage V and high loaded power, while maintaining low noise, high SNR, and large dynamic range operation. This paper proposed a method in which the piezoelectric ceramic-based integrated optical waveguide with 3dB loss at the highest power was applied to the MZI. We built the physical model for the phase transitional behavior based on the piezoelectrics, analyzed the piezoelectric properties of ceramics. The impacts of the piezoelectric ceramic on the property of MPL were discussed numerically.
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22

Miriyala, Kumaraswamy, i Ranjith Ramadurai. "Microstructural influence on piezoresponse and leakage current behavior of Na0.5Bi0.5TiO3 Thin Films". MRS Advances 1, nr 37 (2016): 2597–602. http://dx.doi.org/10.1557/adv.2016.350.

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AbstractSodium bismuth titanate (Na0.5Bi0.5TiO3: NBT) a lead free piezoelectric; exhibits promising features such that it could be an alternate to lead based piezoelectrics. In this work, we report the microstructural influence on piezoelectric and leakage current behavior of NBT thin films grown by pulsed laser ablation (PLD). Various microstructural features like coarse faceted grains and fine spherical grains was achieved by effective optimization of substrate temperature and oxygen partial pressures. The studies reveals that, leakage current of NBT thin films were dominated by interface limited modified Schottky emission type of conduction. The piezoelectric domain studies reveal that for NBT thin films with fine spherical grain the domain pattern was highly dominated by the morphology and in the case of coarse faceted grains the domains were relatively large and the domains were extending beyond the grain boundaries.
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23

Camargo-Chávez, J. E., S. Arceo-Díaz, E. E. Bricio-Barrios i R. E. Chávez-Valdez. "Piezoelectric mathematical modeling; technological feasibility in the generation and storage of electric charge". Journal of Physics: Conference Series 2159, nr 1 (1.01.2022): 012009. http://dx.doi.org/10.1088/1742-6596/2159/1/012009.

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Abstract Emerging technologies are efficient alternatives for satisfying the growing demand for sustainable and cheap energy sources. Piezoelectrics are one of the most promising energy sources derived from emerging technologies. These materials are capable of converting mechanical energy into electricity or vice versa. Piezoelectrics have been used for almost a hundred years to generate electrical and sound pulses. However, the use of piezoelectrics for power generation is constrained by the cost associated with equipment and infrastructure. This problem has been addressed through mathematical models that relate the physical and electrical properties of the piezoelectric material with the voltage generated. Although these models have high performance, they do not incorporate voltage rectification and electrical charge storage stages. This work presents a mathematical model that describes the relationship of the physical and electromechanical properties of a system employing a piezoelectric for energy generation. The voltage of the system and the charge stored in a capacitor are calculated through this model. Also, contour diagrams are presented as a tool for facilitating the efficiency of energy generation.
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Li, Fei, Matthew J. Cabral, Bin Xu, Zhenxiang Cheng, Elizabeth C. Dickey, James M. LeBeau, Jianli Wang i in. "Giant piezoelectricity of Sm-doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 single crystals". Science 364, nr 6437 (19.04.2019): 264–68. http://dx.doi.org/10.1126/science.aaw2781.

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Samarium supersensors Piezoelectric materials produce electric charge in response to changes in stress and are thus good sensor materials. One challenge has been growing single-crystal piezoelectrics with uniform properties. As of now, much of the crystal is discarded because of compositional variations. Li et al. synthesized single crystals of samarium-doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 that have uniform and extremely high piezoelectric properties (see the Perspective by Hlinka). These crystals are ideal for a variety of sensing applications and could reduce cost by eliminating waste. Science , this issue p. 264 ; see also p. 228
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25

Yu, Yu Min. "Design and Analysis of a Piezoelectric Actuator". Advanced Materials Research 308-310 (sierpień 2011): 2131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2131.

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Active materials are a group of solid-state materials whose geometric shape can be related to an energy input in the form of heat, light, electric field, or magnetic field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. The most common active materials used in actuators are piezoelectrics, magnetostrictives, and SMAs. In this paper, a piezoelectric actuation concept is presented that uses a new feed-screw motion accumulation technique. The feed-screw concept involves accumulating high frequency actuation strokes of a piezoelectric stack (driving element) by intermittently rotating nuts on an output feed-screw. The main parts of piezoelectric actuation such as clamp mechanism, rotary mechanism and “L type” driving mechanism are investigated. From the analysis, the deformation and stress of it are all under allowed value of 65Mn. The mathematics model of upside of rotary mechanism rotation motion is established. The results indicate that, the mechanisms of actuator all are satisfy the need of design
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26

Matzen, S., S. Gable, N. Lequet, S. Yousfi, K. Rani, T. Maroutian, G. Agnus, H. Bouyanfif i P. Lecoeur. "High piezoelectricity in epitaxial BiFeO3 microcantilevers". Applied Physics Letters 121, nr 14 (3.10.2022): 142901. http://dx.doi.org/10.1063/5.0105404.

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The large switchable ferroelectric polarization and lead-free composition of BiFeO3 make it a promising candidate as an active material in numerous applications, in particular, in micro-electro-mechanical systems (MEMS) when BiFeO3 is integrated in a thin film form on a silicon substrate. Here, 200-nm-thick Mn-doped BiFeO3 thin films have been epitaxially grown on a SrRuO3/SrTiO3/Si substrate and patterned into microcantilevers as prototype device structures for piezoelectric actuation. The devices demonstrate excellent ferroelectric response with a remanent polarization of 55 μC/cm2. The epitaxial BiFeO3 MEMS exhibit very high piezoelectric response with transverse piezoelectric coefficient d31 reaching 83 pm/V. The BiFeO3 cantilevers show larger electromechanical performance (the ratio of curvature/electric field) than that of state-of-art piezoelectric cantilevers, including well-known PZT (Pb(Zr,Ti)O3) and the hyper-active PMN–PT (Pb(Mg1/3Nb2/3)O3-PbTiO3). In addition, the piezoelectricity in BiFeO3 MEMS is found to depend on the ferroelectric polarization direction, which could originate from the flexoelectric effect and be exploited to further enhance the electromechanical performance of the devices. These results could potentially lead to a replacement of lead-based piezoelectrics by BiFeO3 in many microdevices.
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Cao, Hong Xia, Chuang Zhang, Qing Quan Liu i You Bao Wang. "Elastomechanical Study of Magnetoeletric Coupling in Bilayer of Lithium Zinc Ferrite and Lead Zirconate Titanate". Advanced Materials Research 602-604 (grudzień 2012): 813–20. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.813.

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A theoretical model based on the constitutive equations of piezoelectrics and magnetostrictor is introduced to discuss the magnetoelectric (ME) coupling in freebody bilayer containing magnetostrictive and piezoelectric phases. The ME coupling at low frequency of Ni0.8Zn0.2Fe2O4–PZT bilayer have been studied by using the model and the corresponding material parameters of individual phases. The results show that the ME voltage coefficients can increase to a maximum at a given volume fraction of piezoelectric phase. An approximately linear increase of the maximum has been obtained with strengthening interface coupling. Analysis shows that large magnetostriction, appropriate volume fraction and ideal interface coupling are key ingredients for obtaining excellent ME performance.
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Koyano, Akio. "Piezoelectric transducer for piezoelectric loudspeaker". Journal of the Acoustical Society of America 81, nr 1 (styczeń 1987): 210. http://dx.doi.org/10.1121/1.394967.

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Nan, Ce-Wen, i David R. Clarke. "Piezoelectric Moduli of Piezoelectric Ceramics". Journal of the American Ceramic Society 79, nr 10 (9.08.2005): 2563–66. http://dx.doi.org/10.1111/j.1151-2916.1996.tb09016.x.

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NAGATA, Kunihiro, Katsuyosi INA, Toshimasa MANO i Seiji OMURA. "Piezoelectronic and acoustic properties of porous piezoelectric element." Journal of the Marine Acoustics Society of Japan 22, nr 3 (1995): 183–89. http://dx.doi.org/10.3135/jmasj.22.183.

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Zhang Xin-Wu i Zhang Xiao-Qing. "Piezoelectric and acoustic behavior of polypropylene piezoelectret films". Acta Physica Sinica 62, nr 16 (2013): 167702. http://dx.doi.org/10.7498/aps.62.167702.

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Vilkov E. A., Byshevski-Konopko O.A., Temnaya O. S., Kalyabin D. V. i Nikitov S. A. "Electrosound waves in a PT-symmetric piezoelectric structure near the exceptional point". Technical Physics Letters 48, nr 12 (2022): 74. http://dx.doi.org/10.21883/tpl.2022.12.54954.19291.

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The spectral properties of gap electroacoustic waves in PT-symmetric piezoelectric structures of symmetry class 6 are investigated theoretically. It was found out that, at a certain level of loss and gain in piezoelectrics, the symmetric and antisymmetric modes intersect. The intersection point defines an exceptional point of the PT-symmetric structure. It was shown that the frequency dependence of the amplitude at the exceptional point has an extremely narrow resonance peak, which opens up the possibility of creating supersensitive sensors based on PT-symmetric physical structures. Keywords: PT-symmetry, piezoelectrics, electroacoustic waves, gap structure.
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33

Rogée, Lukas, Lvjin Wang, Yi Zhang, Songhua Cai, Peng Wang, Manish Chhowalla, Wei Ji i Shu Ping Lau. "Ferroelectricity in untwisted heterobilayers of transition metal dichalcogenides". Science 376, nr 6596 (27.05.2022): 973–78. http://dx.doi.org/10.1126/science.abm5734.

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Two-dimensional materials with out-of-plane (OOP) ferroelectric and piezoelectric properties are highly desirable for the realization of ultrathin ferro- and piezoelectronic devices. We demonstrate unexpected OOP ferroelectricity and piezoelectricity in untwisted, commensurate, and epitaxial MoS 2 /WS 2 heterobilayers synthesized by scalable one-step chemical vapor deposition. We show d 33 piezoelectric constants of 1.95 to 2.09 picometers per volt that are larger than the natural OOP piezoelectric constant of monolayer In 2 Se 3 by a factor of ~6. We demonstrate the modulation of tunneling current by about three orders of magnitude in ferroelectric tunnel junction devices by changing the polarization state of MoS 2 /WS 2 heterobilayers. Our results are consistent with density functional theory, which shows that both symmetry breaking and interlayer sliding give rise to the unexpected properties without the need for invoking twist angles or moiré domains.
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34

Parinov, Ivan A., i Alexander V. Cherpakov. "Overview: State-of-the-Art in the Energy Harvesting Based on Piezoelectric Devices for Last Decade". Symmetry 14, nr 4 (7.04.2022): 765. http://dx.doi.org/10.3390/sym14040765.

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Technologies of energy harvesting have been developed intensively since the beginning of the twenty-first century, presenting themselves as alternatives to traditional energy sources (for instance, batteries) for small-dimensional and low-power electronics. Batteries have numerous shortcomings connected, for example, with restricted service life and the necessity of periodic recharging/replacement that create significant problems for portative and remote devices and for power equipment. Environmental energy covers solar, thermal, and oscillation energy. By this, the vibration energy exists continuously around us due to the operation of numerous artificial structures and mechanisms. Different materials (including piezoelectrics) and conversion mechanisms can transform oscillation energy into electrical energy for use in many devices of energy harvesting. Piezoelectric transducers possessing electric mechanical coupling and demonstrating a high density of power in comparison with electromagnetic and electrostatic sensors are broadly applied for the generation of energy from different oscillation energy sources. For the last decade, novel piezoelectric materials, transformation mechanisms, electrical circuits, and experimental and theoretical approaches with results of computer simulation have been developed for improving different piezoelectric devices of energy harvesting. This overview presents results, obtained in the area of piezoelectric energy harvesting for the last decade, including a wide spectrum of experimental, analytical, and computer simulation investigations.
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Upadhyay, Ashutosh, Naveen Kumar, Gobinda Das Adhikary, Ram Prakash Singh, Anupam Mishra i Rajeev Ranjan. "A combination of large unipolar electrostrain and d33 in a non-ergodic relaxor ferroelectric". Journal of Applied Physics 132, nr 20 (28.11.2022): 204102. http://dx.doi.org/10.1063/5.0107193.

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One of the important requirements for piezoelectric materials for use as high strain actuators is that they exhibit large unipolar electrostrain with minimum hysteresis. While large unipolar electrostrain >1% is generally achievable in good quality single crystals, most polycrystalline piezoelectric show low values < 0.4%. Unipolar electrostrain 0.5%–0.7% in polycrystalline piezoelectrics has often been reported in Na0.5Bi0.5TiO3-based compositions at the non-ergodic ergodic boundary. Not amenable to poling, such materials exhibit almost nearly zero direct piezoelectric coefficient ( d33 ∼ 0 pC/N) and cannot be simultaneously used as a sensor. In this paper, we report a combination of large unipolar electrostrain of ∼0.6% with small strain hysteresis of 25% in a Sn-modified relaxor ferroelectric system PbTiO3–Bi(Ni1/2Zr1/2)O3. It exhibits d33 ∼ 340 pC/N, which is stable up to 130 °C, and large signal converse piezoelectric coefficient d33* ∼ 1200 pm/V. A combination of large d33 and d33* in the same material makes it an important candidate for simultaneous use as a sensor and high strain actuators. X-ray diffraction study in situ with the electric field suggests that large electrostrain with low strain hysteresis in this system is because of the increased reversible switching of the field stabilized tetragonal ferroelastic domains.
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36

Korotkov, L., Likhovaja Likhovaja, R. Levitsky, I. Zachek i A. Vdovych. "Dielectric, Electromechanical and Elastic Properties of K (NH ) H PO Compounds". Фізика і хімія твердого тіла 16, nr 1 (15.03.2015): 116–22. http://dx.doi.org/10.15330/pcss.16.1.116-122.

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We describe the available experimental data for the dielectric, piezoelectric, and elastic characteristics of the antiferroelectric crystals, using the proposed microscopic theory. Within the framework of the thermodynamic theory and using the obtained experimental data we calculate the dielectric, piezoelectrlic, and elastic characteristics of the compounds at > 0.32.
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Shinekumar, K., i Soma Dutta. "ChemInform Abstract: High-Temperature Piezoelectrics with Large Piezoelectric Coefficients". ChemInform 46, nr 31 (16.07.2015): no. http://dx.doi.org/10.1002/chin.201531251.

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Li, Wei, Zhe Wang, Jigong Hao, Peng Fu, Juan Du, Ruiqing Chu i Zhijun Xu. "Poling effects on the structural, electrical and photoluminescence properties in Sm doped BCST piezoelectric ceramics". Journal of Materials Chemistry C 6, nr 42 (2018): 11312–19. http://dx.doi.org/10.1039/c8tc03960g.

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39

He, Zhongchen, François Rault, Astha Vishwakarma, Elham Mohsenzadeh i Fabien Salaün. "High-Aligned PVDF Nanofibers with a High Electroactive Phase Prepared by Systematically Optimizing the Solution Property and Process Parameters of Electrospinning". Coatings 12, nr 9 (7.09.2022): 1310. http://dx.doi.org/10.3390/coatings12091310.

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Poly(vinylidene fluoride) (PVDF)-electrosprayed nanofibers have been the subject of much research due to their flexibility and piezoelectric properties compared to other piezoelectrics, for example, ceramics or other polymeric materials. The piezoelectric performance of PVDF is mainly related to the presence of β-phase. This study aims to determine the influence of working and formulation parameters on the generation of β-phase, morphology, and crystal structure of PVDF nanofibers. In addition, this research innovatively analyzes the effect of the dispersion state of PVDF molecular chains in the solvent on the electrospinning results. The morphology and crystal structure of PVDF nanofibers were determined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR). Beadless nanofibers are obtained when the PVDF concentration reaches the semi-diluted regime entangled in dimethylformamide (DMF) or DMF/acetone solution. The optimization of the process parameters (static collector, tip to collector distance—25 cm, flow rate—1 mL/h, applied voltage—20 kV) allows the increase in the β-phase fraction from 68.3% ± 1.2% to 94.5% ± 0.6% for a PVDF concentration of 25 w/v% in a DMF/acetone mixture (2/3 v/v). With these same parameters applied to a rotating collector, it was observed that the piezoelectric performance is at maximum for a maximum β-phase fraction of 90.6% ± 1.1%, obtained for a rotational speed of 200 rpm. The effect of orientation of PVDF nanofibers on piezoelectric properties was quantitatively discussed for the first time; the piezoelectric properties are independent of the alignment of the nanofibers.
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Zhang, Zhong Hua, Guang Ming Cheng, Jun Wu Kan, Ping Zeng i Jian Ming Wen. "Influence of Multiple Piezoelectric Effects on Piezoelectric Coefficient of Piezoelectric Ceramics". Applied Mechanics and Materials 101-102 (wrzesień 2011): 922–25. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.922.

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In this paper, theoretical analysis is performed on the influence of multiple piezoelectric effects on piezoelectric coefficients. And a kind of classical piezoelectric ceramics was adopted to conduct the experimental validation. The experimental results of short-circuit boundary condition are obtained by the methods that a capacitor whose capacitance is much larger than that of the stack is parallel with PZT-5. Influence results are obtained through comparing them with open-circuit piezoelectric coefficient. Experimental result shows that multiple piezoelectric effects make piezoelectric coefficient of PZT-5 be altered by 18%.
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41

KOSEC, MARIJA, BARBARA MALIČ, ANDREJA BENČAN, TADEJ ROJAC i JENNY TELLIER. "ALKALINE NIOBATE-BASED PIEZOCERAMICS: CRYSTAL STRUCTURE, SYNTHESIS, SINTERING AND MICROSTRUCTURE". Functional Materials Letters 03, nr 01 (marzec 2010): 15–18. http://dx.doi.org/10.1142/s1793604710000865.

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In this review, the crystal structure and the synthesis of the sodium potassium niobate ( K 0.5 Na 0.5 NbO 3) as a promising candidate for lead-free piezoelectrics are addressed. The sintering and the microstructure as prerequisites for obtaining ceramics with reliable and sufficiently high piezoelectric properties for selected applications are discussed.
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42

Ogura, Seiichiro, i Yoshihiro Kobayashi. "Piezoelectric gyro element and piezoelectric gyroscope". Journal of the Acoustical Society of America 124, nr 3 (2008): 1394. http://dx.doi.org/10.1121/1.2986194.

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Sasaki, Yukinori. "Piezoelectric vibration element and piezoelectric filter". Journal of the Acoustical Society of America 121, nr 5 (2007): 2479. http://dx.doi.org/10.1121/1.2739132.

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Tanaya, Hideo. "Piezoelectric vibration piece, piezoelectric device using piezoelectric vibration piece, portable phone unit using piezoelectric device, and electronic equipment using piezoelectric device". Journal of the Acoustical Society of America 120, nr 3 (2006): 1170. http://dx.doi.org/10.1121/1.2355972.

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45

Ohshima, Tsuyoshi. "Piezoelectric vibration element, piezoelectric vibrator, piezoelectric oscillator, frequency stabilization method, and method of manufacturing the piezoelectric vibrator". Journal of the Acoustical Society of America 125, nr 3 (2009): 1842. http://dx.doi.org/10.1121/1.3099445.

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Handoko, Albertus D., i Gregory K. L. Goh. "Hydrothermal epitaxy of lead free (Na,K)NbO3-based piezoelectric films". MRS Proceedings 1547 (2013): 45–52. http://dx.doi.org/10.1557/opl.2013.634.

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ABSTRACTLead free niobate solid solutions can exhibit piezoelectric properties comparable to that of lead zirconate titanate piezoelectrics in the vicinity of its morphotropic phase boundary (MPB). Here we describe how (Na,K)NbO3 and (Na,K)NbO3-LiTaO3 solid solution thin films can be grown epitaxially by the hydrothermal method at temperatures of 200 °C or below in water and be made ferro- and piezoelectrically active by a simple 2 step post growth treatment.
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47

Ma, Yu Ting, Jun Zhong, Li Zhang i Yun Liang Wu. "Piezoelectric Properties of 1-3 Piezoelectric Tubular Composites". Applied Mechanics and Materials 217-219 (listopad 2012): 24–30. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.24.

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The piezoelectric coefficients of 1-3 piezoelectric tubular composites are studied. Taking into account the non-uniform electric field distribution in piezoelectric tube, the piezoelectric coefficients as functions of volume fraction, aspect ratio, tube density and matrix materials were discussed. By means of finite element software, the relationship between piezoelectric coefficients and ceramic volume fraction was derived to validate theoretical results. This research provides theoretical guidance and basis for the design of 1-3 piezoelectric tubular composites.
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48

Shi, Hongwei, Kai Li, Feng Li, Jianxing Ma, Yubing Tu, Mingsheng Long, Yilin Lu, Weiping Gong, Chunchang Wang i Lei Shan. "Enhanced Piezoelectricity and Thermal Stability of Electrostrain Performance in BiFeO3-Based Lead-Free Ceramics". Nanomaterials 13, nr 5 (5.03.2023): 942. http://dx.doi.org/10.3390/nano13050942.

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BiFeO3–based ceramics possess an advantage over large spontaneous polarization and high Curie temperature, and are thus widely explored in the field of high–temperature lead–free piezoelectrics and actuators. However, poor piezoelectricity/resistivity and thermal stability of electrostrain make them less competitive. To address this problem, (1 − x) (0.65BiFeO3–0.35BaTiO3)–xLa0.5Na0.5TiO3 (BF–BT–xLNT) systems are designed in this work. It is found that piezoelectricity is significantly improved with LNT addition, which is contributed by the phase boundary effect of rhombohedral and pseudocubic phase coexistence. The small–signal and large–signal piezoelectric coefficient (d33 and d33*) peaks at x = 0.02 with 97 pC/N and 303 pm/V, respectively. The relaxor property and resistivity are enhanced as well. This is verified by Rietveld refinement, dielectric/impedance spectroscopy and piezoelectric force microscopy (PFM) technique. Interestingly, a good thermal stability of electrostrain is obtained at x = 0.04 composition with fluctuation η = 31% (Smax'−SRTSRT×100%), in a wide temperature range of 25–180 °C, which is considered as a compromise of negative temperature dependent electrostrain for relaxors and the positive one for ferroelectric matrix. This work provides an implication for designing high–temperature piezoelectrics and stable electrostrain materials.
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Pecherskaya, Ekaterina A., Andrey V. Fimin, Vladimir S. Alexandrov, Yuriy A. Varenik, Artem V. Volik i Alexey I. Levin. "Metrological Analysis of the Relationship Model between the Properties of Piezoelectric Materials". Materials Science Forum 1049 (11.01.2022): 305–10. http://dx.doi.org/10.4028/www.scientific.net/msf.1049.305.

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The properties of piezoelectric materials due to the effect of electrical, mechanical, thermal, radiation, and chemical parameters are systematized. On the basis of Maxwell's relations (obtained from expressions for thermodynamic functions) and the application of the system analysis methodology, it made it possible to develop an analytical model of the relationship between the parameters and properties of piezoelectrics in the form of a system of equations. The results of the metrological analysis of an analytical model, which made it possible to identify the sources of additional errors in the measurement of parameters, to derive formulas for their calculation, which in turn contributes to an increase in the accuracy of measurements of the piezoelectrics parameters and products based on them, are presented.
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Rushchitskii, Ya Ya. "Waves and the direct piezoelectric effect in two-phase piezoelectrics". International Applied Mechanics 31, nr 10 (październik 1995): 818–24. http://dx.doi.org/10.1007/bf00846882.

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