Abstract
The investigation of acoustic properties in layered crystals KY(MoO4)2 and Si20Te80 isotropic alloy with nanocrystallite inclusions has been carried out. The acousto-optic and pulse-echo techniques were used. The measurements of ultrasound velocity and attenuation, and also sound wave spectrum evolution along different crystallographic axes in wide ranges of frequency (14-1800 MHz) temperatures (90-300 K) and sound intensities (0.04-100 W cm-2) were fulfilled. Extremely large values of nonlinear coefficients and anharmonicity constants of longitudinal photon modes across the layers and crystallite boundaries have been found. It has been shown that anharmonicity of the bonding force across the layers determines the anisotropy of the mechanical strength in layered crystals.
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