Electro-mechanical equivalent circuit of a piezoelectric ceramic thin circular ring in radial vibration
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The piezoelectric PZN-PZT powders were prepared by solid state sintering technique. PZN-PZT/PVDF 0-3 composites were fabricated by dispersing PZN-PZT powders into the PVDF polymer matrix. The effects of the process valiable and the content of PZN-PZT powders on the piezoelectric properties of the composites were investigated. The results indicate that solution mixing method was more suitable to prepare the PZN-PZT/PVDF composites which have good piezoelectricity. The highest d33 attains 35.9 pC·N-1, was obtained to the composites which contain 90wt% ceramic powders and was polarized under 6kV·mm-1 for 20 min at 110℃.
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PZT powder was prepared by using sol-gel technique.X-ray diffraction and SEM examination showed that the PZT powder is perovskite crystal,and the diameter of the PZT powder is between 0.1~1μm.A PZT/PVDF piezoelectric composite was made through incorporation of the PZT power into PVDF polymer matrix by means of solution blending.Experiment indi-cates that the piezoelectric constant of the composite increases with the incvease of PZT content and reaches maximum when the volume content of PZT is 70%.
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Lead zirconate titanate
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Abstract Lead-free piezoelectric ceramics, (Na0.5Bi0.5) 0.92Ba0.08TiO3 (BNT-BT) have been synthesized by a conventional solid state sintering method. The dependence of temperature on dielectric and ferroelectric properties of lead-free piezoelectric ceramics were investigated. The ceramics exhibit a giant strain with the increase of temperature. The piezoelectric coefficient (d33) is about 149pC/N at RT. The electromechanical properties were explained based on a field induced antiferroelectric-ferroelectric phase transition. Keywords: BNT-BTpiezoelectric ceramicselectromechanical propertiesphase transition Acknowledgments This work has been supported by the National Nature Science Foundation (50672075), the NCET and 111 Program (B08040) of MOE, and Xi'an Science & Technology Foundation (CXY08006, XA-AM-200905, XA-AM-200906), and the Fundamental Research Foundation (NPU-FFR-200703) of NPU and SKLSP Research Fund (40-QZ-2009) of China.
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ABSTRACT 0.3Pb(Zn1/3Nb2/3)O3-0.7Pb0.96La0.4(ZrxTi1−x)O3(PZN-PLZT, x = 0.5∼0.53) transparent piezoelectric ceramics with high density and pure perovskite have been synthesized by a two-stage hot-pressing procedure. The bulk densities of the specimens were measured by Archimedes method, and they are very close (> 99%) to the theoretical density. With the Zr/Ti ratios varying from 50/50 to 53/47, the d33 and kp show an ascending and descending trend, namely a peak of piezoelectric properties. The maximum of d33 and kp are 845pC/N and 0.70, respectively. The transmittances of the specimens were tested at the wavelength ranging from 300 nm to 800 nm. The transmittance of the specimens was enhanced with the increase of the wavelength. And the specimens with Zr/Ti = 52.5/47.5 have maximum transmittance. Transparence and high piezoelectric properties of PZN-PLZT brighten its application in optical and electrical devices.
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Lead zirconate titanate
Electromechanical coupling coefficient
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Abstract The Low-firing PZT, PNN-PZT, PMN-PNN-PZT systems piezoelectric ceramics with high performance have been studied systematically. By doping suitable additives and optimizing processing, excellent piezoelectric properties could be obtained: Kp=0.50∽0.74, d33=(300∽705)×10−12C/N, ϵ33 T /ϵ0 =800∽4100, tanδ=(40∽250)×10−4. The microstructure and the mechanism of transition liquid phase sintering were also investigated. The low firing piezoelectric ceramics have been used for multilayer piezoelectric transformers, ultrasonic motors and thick film devices.
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