 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 2]](ra5145fig2mag.jpg)
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Figure 2
Piezo-couplings |ka| and |kb| of an engineered ZnO plate formed by averaging over facet angle θ ≃ 31.664°, plotted versus tilt (texture) angle γ. Driving electric field is normal to the substrate plane. Waves a and b are quasi-thickness extension, and quasi-thickness shear, respectively. Note the similar, but reduced, values of coupling compared with Foster et al. (1968  ), where the facet angle θ = 0°. Wave c, (pure shear) is inert to thickness-directed fields. In devices using the quasi-shear mode, a practical tilt angle would be at, or near, the value where |ka| = 0; here the b wave coupling is nearly a maximum. |
![[Figure 2]](ra5145fig2.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
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