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694 results on '"Zhu, Kongjun"'

30. Effect of Zr/Ti Ratio on the Structure and Electrical Properties of 0.7PbZrxTi1−xO3-0.3Pb(Zn1/3Nb2/3)O3 Piezoelectric Ceramics.

Author

Yang, Cong, Du, Jianzhou, Chen, Yuansheng, Li, Yunping, Yan, Jingyi, Wang, Luming, and Zhu, Kongjun

Subjects
PIEZOELECTRIC ceramics, MORPHOTROPIC phase boundaries, TERNARY system, X-ray diffraction
Abstract

Ternary system piezoelectric ceramics 0.7PbZrxTi1−xO3-0.3Pb(Zn1/3Nb2/3)O3 (abbreviated as 0.7PZTx-0.3PZN) were prepared by a traditional solid-phase process. With the increase in Zr content, the electrical properties of the ceramics were significantly improved, and this result could be attributed to the change in the ceramic phase structure. The relationship between the change in Zr content and the ceramic phase structure and properties was investigated in detail by component modulation. X-ray diffraction (XRD) analyses showed that the phase structure of the ceramics undergoes a transition from the coexistence of tetragonal (T) and rhombohedral (R) phases to the predominance of rhombohedral (R) phases as the Zr content x increases. The phase structure of the ceramics at x = 0.49 is closer to the morphotropic phase boundary (MPB), with about 32% of the T-phase and 68% of the R-phase, and possesses good electrical properties: d33 = 483 pC/N, kp = 0.69, εr = 2171.7, tanδ = 0.016, Tc = 292.5°C, Pr = 35.9 μC/cm2, Ec = 7.7 kV/mm. Constructing the MPB of 0.7PZT-0.3PZN piezoelectric ceramics by varying the Zr content can be effective in improving the electrical properties and understanding more broadly how the change in Zr/Ti composition affects the piezoelectric behavior. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Design and Performance Study of Carbon Fiber Structural Supercapacitor Based on Dual Epoxy Polymer Solid Electrolyte

Author

Zhang, Zheng, primary, Zhu, Kongjun, additional, Xu, Xin, additional, Guo, Jun, additional, Liu, Yang, additional, Zhang, Jie, additional, Wu, Xiaorao, additional, Zhang, Peida, additional, Zhu, Zhen, additional, Xu, Jiayi, additional, Ji, Dingwei, additional, Su, Qi, additional, Kong, Zhihan, additional, Wang, Jing, additional, Wu, Qi, additional, Yan, Kang, additional, and Liu, Jingsong, additional

Published
2024
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50. A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sources

Author

Shen, Hui, Qiu, Jinhao, Ji, Hongli, Zhu, Kongjun, Balsi, Marco, Giorgio, Ivan, and dell'Isola, Francesco

Subjects
Physics - Classical Physics
Abstract

In the paper, a vibration damping system powered by harvested energy with implementation of the so-called SSDV (synchronized switch damping on voltage source) technique is designed and investigated. In the semi-passive approach, the piezoelectric element is intermittently switched from open-circuit to specific impedance synchronously with the structural vibration. Due to this switching procedure, a phase difference appears between the strain induced by vibration and the resulting voltage, thus creating energy dissipation. By supplying the energy collected from the piezoelectric materials to the switching circuit, a new low-power device using the SSDV technique is proposed. Compared with the original self-powered SSDI (synchronized switch damping on inductor), such a device can significantly improve its performance of vibration control. Its effectiveness in the single-mode resonant damping of a composite beam is validated by the experimental results., Comment: 11 pages

Published
2010

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