Dispersion Diagram of Trigonal Piezoelectric Phononic Structures with Langasite Inclusions

Autor(es)

Miranda, Jr., Edson ^{[1, 2, 3]} ; Aranas, Jr., Clodualdo ^[4] ; Rodrigues, Samuel ^[3] ; Silva, Helio ^[1] ; Reis, Gedeon ^[3] ; Paiva, Antonio ^[3] ; Dos Santos, Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP FEM DMC, Rua Mendeleyev, 200, BR-13083970 Campinas, SP - Brazil

^[2] Fed Inst Maranhao, IFMA EIB DE, Rua Afonso Pena, 174, BR-65010030 Sao Luis, MA - Brazil

^[3] Fed Inst Maranhao, IFMA PPGEM, Ave Getulio Vargas, 4, BR-65030005 Sao Luis, MA - Brazil

^[4] Univ New Brunswick, Dept Mech Engn, Fredericton, NB E3B 5A3 - Canada

• Tipo de documento: Artigo Científico
• Fonte: CRYSTALS; v. 11, n. 5 MAY 2021.
• Citações Web of Science: 3

Resumo

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 D-3 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. (AU)

• Processo FAPESP: 18/15894-0 - Projeto e otimização de estruturas periódicas para aprimoramento de desempenho vibroacústico
• Beneficiário: Carlos de Marqui Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático