Piezoelectric resonance characteristics of SrBi 2 Nb 2 O 9 -based ceramics were studied for thickness-extensional (TE) and thickness-shear (TS) vibration modes. A resonator with a double-layer structure was also prepared with a co-firing technique to generate the second harmonics of TE (TE2) vibration mode. Single mode resonance characteristics are realized for TS mode vibration and the third harmonic TE (TE3) mode vibration on an SBN single plate. The double-layer-structure resonator also shows a good single mode resonance characteristic for the TE2 mode. This TE2 mode resonator has superior advantages in terms of piezoelectric resonant characteristics, compared to other single mode resonators such as the TS- or TE3-mode resonator.
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Ando et al. (2003) studied this question.
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