The piezoelectric and dielectric properties of Ca-additive Sm-modified PbTiO3 ceramics intended for surface acoustic wave devices
| Autor: | Te-Yi Chen, Sheng-Yuan Chu |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Electromechanical coupling coefficient
Materials science Surface acoustic wave Doping Analytical chemistry Mineralogy Dielectric Piezoelectricity chemistry.chemical_compound chemistry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Curie temperature Lead titanate Ceramic |
| Zdroj: | Journal of the European Ceramic Society. 23:2171-2176 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/s0955-2219(03)00017-7 |
| Popis: | Sm-modified lead titanate ceramics with a composition of (Pb 0.88− x Ca x Sm 0.08 )(Ti 0.98 Mn 0.02 )O 3 ; x =0.11∼0.17 were prepared by conventional mixed-oxide method. The dielectric and piezoelectric properties of these doped ceramics were measured at room temperature. Microstructural and compositional analyses have been carried out using SEM and XRD. The Curie point ( T c ) was studied by measuring the dielectric behavior as a function of temperature. The experiments successfully showed that Ca additive not only reduce the lattice anisotropy but is also helpful in providing a higher thickness electromechanical coupling coefficient, k t (>0.57), than that of conventional PbTiO 3 based ceramics while still keeping a small planar electromechanical coupling coefficient, k p . In addition, the Ca additive produced a higher phase velocity and high electromechanical coupling coefficient. The SAW properties of our samples ( V p and k 2 ) are better than those of commercially-made PZT and PT samples. |
| Databáze: | OpenAIRE |
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