Ultra high frequency attenuation limits in synthetic IIa diamond single crystal were studied. The investigations were provided by High-overtone Bulk Acoustic Resonator "Al/AlN/Mo/(100) diamond". It was shown, that the change of Akhiezer's attenuation regime to Landau-Rumer one takes place at f ª 1 GHz. The experimental results on the quality parameter showed Q¥f ª 1.8◊10 13 Hz for Akhiezer's regime, and Q¥f ª f¥1.8◊10 4 Hz for Landau-Rumer regime. As a consequence on a higher frequencies diamond single crystal has more preferred acoustic parameters including a lower acoustic attenuation in comparison with known acoustoelectronic materials.
The resonant transformation of acoustic waves in "Al/AlN/Mo/(100) diamond" piezoelectric structure has been studied by means of 2D FEM simulation. The nature of arising acoustical modes has been defined by the detail investigation of fields of elastic displacements. It was shown that the appearance of strongest spurious resonant peaks at frequencies above the bulk acoustic overtones is concerned with Lamb-like modes within diamond substrate, excited on the critical frequencies. In these points Lamb mode transforms into standing plate wave. Experimental and calculated data are in good accordance.
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