| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 92 === Samarium (Sm) modified lead titanate (PbTiO3) ceramics with a composition of (Pb0.85Sm0.1)(Ti0.98Mn0.02)O3 (PT) piezoceramics doped with Ba(Cu0.5W0.5)O3 (BCW), BiFeO3 (BF), and SiO2 were prepared by conventional mixed-oxide method.
Microstructural and compositional analyses of these PbTiO3-based ceramics have been carried out using X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of BCW, BF, and SiO2 additives on sintering temperature and piezoelectric properties of these ceramics have been investigated. We have successfully showed that additives like BCW, BF, and SiO2 were helpful in lowering PT’s sintering temperature from 1200℃ to 1100℃ and still keep good piezoelectric and dielectric properties.
Surface acoustic wave (SAW) filters were also fabricated and properties, including phase velocity and temperature coefficient of frequency (TCF), were measured.
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