The analysis of the effect of homogeneous mechanical stress on the acoustic wave propagation in the “La3Ga5SiO14/fused silica” piezoelectric layered structure

• The “LGS/fused silica” piezoelectric layered structures have been investigated.
• Acoustic wave propagation under the uniaxial stress influence has been calculated.
• Physical nonlinearity has of great importance at wave propagation in stressed structures.
• BAW transformation into the “Anisimkin Jr. mode” in the langasite has been described.

The results of computer simulation taking into account the linear and nonlinear material constants have been presented. Study of the influence of external uniaxial mechanical stress on the dispersive characteristics of elastic waves in piezoelectric structures as “La3Ga5SiO14/fused silica” has been executed. The comparison of elastic wave velocity changes under the influence of an uniaxial stress while a full set of nonlinear material constants of crystalline layer + geometric nonlinearity, or only geometric nonlinearity of the layer induced by the static deformation of a substrate, has been fulfilled.