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17 Fall

-As we have seen, the property of piezoelectricity couples the two sets of equations: electrical and acoustic equations.

-The Christoffel equation is the mathematical forms, representing the propagation of AC phonons in 3D. Due to the piezoelectricity, extra terms, dependent on the piezoelectric and permittivity matrices, are added to the stiffness matrix. We say that the components of the stiffness matrix have been piezoelectrically stiffened and apply them to Christoffel equation .

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