Papers by Keyword: Piezoelectric Ceramic (PZT)

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Authors: Yong Jie Zhao, Yu Zhen Zhao, Rong Xia Huang, Rong Zheng Liu, He Ping Zhou
Abstract: (1-x) (K0.475Na0.475Li0.05)(Nb0.975Sb0.025)O3-xmolBiFeO3 (x=0, 0.002, 0.004, 0.006, 0.008) doped with 0.8mol%CuO lead-free piezoelectric ceramics were prepared by the solid state reaction technique. X-ray diffraction patterns suggested that all the ceramics presented perovskite structure. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. The ceramic (x=0.002) near room temperature exhibited excellent electrical properties (piezoelectric constant d33=172pC/N, planar electromechanical coupling factor kp=0.43, and dielectric constant =418). A relatively high mechanical quality factor (Qm=200) was also obtained in this particular composition. All these results revealed that this system might become a promising candidate for lead-free piezoelectric materials.
Authors: Hyeon Gyu Beom, Y.H. Kim, C.K. Yoon, Chong Du Cho
Abstract: A crack on the conductive interface between two dissimilar piezoelectric ceramics under electromechanical loading is investigated. The closed form of the singular crack tip fields for the interface crack is derived here using an analysis based on analytic functions. It is shown that the interfacial crack-tip field consists of a pair of oscillatory singularities. A closed form of the solution for a finite crack on the conductive interface between dissimilar piezoelectric media is also derived.
Authors: Pei Cao, Jia Lin Zhu
Abstract: In this paper, the basic principles of the surface acoustic wave (SAW) formed in the periodically poled piezoelectric ceramic has been elaborated theoretically. The modal and harmonic analyses has been performed by utilizing ANSYS software for the periodically poled piezoelectric composite structure (adjacent piezoelectric polarization direction opposite) which composed by piezoelectric ceramic (PZT-4). The data of simulation result have been processed and obtained the following conclusion: the surface wave can be formed in the periodically poled piezoelectric domain with a relatively large amplitude, the motion track of each particle in the SAW is an ellipse by combined the transverse modal displacement and longitudinal modal displacement of each surface node. These conclusions are same as the theoretical values, the simulation results are very useful for designing SAW device with periodically poled piezoelectric ceramic.
Authors: Ya Fang Yin, Yan Na Liao
Abstract: This paper give a new design of three level phase delay control polarization controller, which is the key components for state of polarization (SOP) control in the area of coherent optical communication and polarization mode dispersion compensation. Piezoelectric ceramic are used in three of the phase delay unit to realize phase delay control. The polarization controller can achieve infinite control, convert arbitrary input state of polarization to arbitrary expected output state of polarization under low control voltage.
Authors: Ying Jun Sang, Xue Liang Huang
Abstract: In this paper, the piezoelectric ceramic electronic voltage transducer principles is researched, a new internal structure of the measurement system is put forward and the signal processing methods are discussed. On the basis of the analysis of freedom cantilever optical measurement methods for the longitudinal piezoelectric deformation, we proposes the piezoelectric resonance method to detect amplitude of piezoelectric ceramic and cleverly designed mechanical structure, in which the lightweight elastic material is used to support the resonance thin film. This structure overcomes the impact of cantilever longitudinal self-gravity and horizontal friction between cantilever and piezoelectric ceramic, and can improve the deformation measurement accuracy. 10kV 0.05 class transducer voltage measurement accuracy is achieved theoretically.
Authors: You Guang Li, Zai Li Chen
Abstract: The paper presents a novel structure cylinder driving USM (ultrasonic motor). Through development and experimentation, the torque and rotational speed of the prototype were tested, which proves that this type of USM has a very simple structure, self-adjusting pre-tightening force and compensation for wear. The results verify the theoretical feasibility and provide instructions for the industrialization of this type of USM.
Authors: Mao Qiang Li, Xue Feng Chen
Abstract: Ceramic discs are prepared with PZT powder doped with Sr and Mn, which is prepared through a modified Pechini process. A micro-actuator consists of two concentric rings with thickness of 0.15 mm made of PZT doped with Sr and Mn, a copper disc, on which the PZT rings are firmly mounted with organic glue, and a ceramic rod of φ2.5x100 mm stuck at the center of the disc. The top of the ceramic rod serves as pointer of the actuator. The outer PZT ring is equally divided into four quadrants separated each other, of which two vicinal parts are poled with the same direction as that of the inner PZT ring. The other two quadrants in the outer ring are poled with the opposite direction. The inner ring and the four quadrants of the outer ring are excited by three DC powers, respectively. Bending deformation of the copper disc is caused by properly regulating the excitation voltages exerted on the PZT ceramics. The position of the top of the ceramic rod varies with the bending deformation of the copper disc.
Authors: Xiang Cheng Chu, Ren Bo Yan, Li Yan, Long Tu Li
Authors: Hyeon Gyu Beom, Y.H. Kim, C. Cho, Chang Boo Kim
Abstract: A thin electrode layer at the interface between two dissimilar linear piezoelectric materials under electromechanical loading is investigated. The complex function theory is employed to obtain the exact solution to a finite thin conductive layer. Special consideration is devoted to the structure of singular stress and electric fields near the tip of the thin electrode between two dissimilar piezoelectric materials. The stress and electric field are found to have an inverse square root singularity. The electric field intensity factor characterizes uniquely the singular fields close to the edge of the conductive line sheet.
Authors: Hong Yu Jia, Xiao Fei Wang
Abstract: The finite element model of piezoelectric cantilever laminate is established with ANSYS and the vibration character of the model is carried out. The vibration characters of different size of piezoelectric laminate and different voltage is compared. The maximum displacement demonstrates the trend of decreasing step by step with increasing the thickness of the base steel layer. The displacements of the same base steel layer and piezoelectric layer are increasing with the incremental voltage.
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