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- Title
Dispersion Diagram of Trigonal Piezoelectric Phononic Structures with Langasite Inclusions.
- Authors
Miranda Jr., Edson; Aranas Jr., Clodualdo; Rodrigues, Samuel; Silva, Hélio; Reis, Gedeon; Paiva, Antônio; Dos Santos, José; Zhang, Shujun
- Abstract
The dispersion relation of elastic Bloch waves in 1-3 piezoelectric phononic structures (PPnSs) with Langasite (La3Ga5SiO14) inclusions in a polymeric matrix is reported. Langasite presents promising material properties, for instance good temperature behaviour, high piezoelectric coupling, low acoustic loss and high quality factor. Furthermore, Langasite belongs to the point group 32 and has a trigonal structure. Thus, the 2-D bulk wave propagation in periodic systems with Langasite inclusions cannot be decoupled into XY and Z modes. The improved plane wave expansion (IPWE) is used to obtain the dispersion diagram of the bulk Bloch waves in 1-3 PPnSs considering the classical elasticity theory and D3 symmetry. Full band gaps are obtained for a broad range of frequency. The piezoelectricity enhances significantly the band gap widths and opens up a narrow band gap in lower frequencies for a filling fraction of 0.5. This study should be useful for surface acoustic wave (SAW) filter and 1-3 piezocomposite transducer design using PPnSs with Langasite.
- Subjects
ACOUSTIC surface waves; THEORY of wave motion; BLOCH waves; BAND gaps; DISPERSION relations; POLYMERIC nanocomposites; PIEZOELECTRIC thin films; PIEZOELECTRICITY
- Publication
Crystals (2073-4352), 2021, Vol 11, Issue 5, p491
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst11050491