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Crystals 2016, 6(3), 25; doi:10.3390/cryst6030025

Theoretical Analysis of SAW Propagation in 3C-SiC/c-AlN

Istituto di Acustica e Sensori Corbino, IDASC-CNR, Via del Fosso del Cavaliere 100, Roma 00133, Italy
Academic Editor: Helmut Cölfen
Received: 31 December 2015 / Revised: 10 February 2016 / Accepted: 10 March 2016 / Published: 15 March 2016
(This article belongs to the Section Crystal Engineering)
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Abstract

The anisotropic materials as the acoustic wave propagating medium introduce the dependence of the phase velocity on the wave propagation direction, as opposed to the isotropic counterparts; in addition, the profile of the particle displacement components can be quite different, depending on the crystal type and propagation direction. The propagation of surface and bulk acoustic waves (SAWs and BAWs) along the (001), (111) and (110) planes of cubic SiC crystals have been studied. For specific propagation directions in these planes, slight variations in the velocity of the elastic surface waves are found. It was observed that Rayleigh-type, generalized and pseudo-surface waves can propagate at specific directions, thus confirming how the anisotropic behavior of the bare SiC substrate modifies the existence and the field profile of the SAW that propagates at its free surface. Finally, the SAW propagation along AlN/SiC-based multilayered structures is studied for the three SiC planes, different AlN piezoelectric layer thicknesses and electrical boundary conditions. View Full-Text
Keywords: 3C-SiC; AlN; anisotropy; SAW; BAW 3C-SiC; AlN; anisotropy; SAW; BAW
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Caliendo, C. Theoretical Analysis of SAW Propagation in 3C-SiC/c-AlN. Crystals 2016, 6, 25.

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