Fabrications of the Nb doped PZT ceramics and their applications on the Surface Acoustic Wave (SAW) Filters
| Autor: | I-Ta Tsai, 蔡億達 |
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| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 Lead zirconate titanate (PZT) ceramics have been used in various applications due to their excellent piezoelectric characteristics, such as sensors, actuators, filters and transducers. In this thesis, we try to add Nb dopants in the PZT (52/48) ceramic systems to form soft PZT samples and investigate the doping effects on the characteristics of the samples. The effects of the sintering temperature and the poling condition on the properties of the samples are also investigated. Microstructural and compositional analyses of these doped samples have been carried out using XRD and SEM. The dielectric constant measured at 1kHz is about 1500 and the loss factor is small than 2%. The maximum planar electromechanical coupling coefficient, kp, is 0.6. It showed that the Nb additives were helpful improve both of the dielectric and piezoelectric properties. In addition, we add BiFeO3 (BF) and Ba(Cu0.5W0.5)O3 (BCW) in the system to lower the sintering temperature. We also investigate the doping effects of BF and BCW on the characteristics of the samples. Finally, a surface acoustic wave device was fabricate using the PZT-based ceramic and the properties, including phase velocity and ctromechanical coupling coefficient, were measured. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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