Abstract:
Anisotropy of the attenuation of acoustic waves in lanthanum gallosilicate crystals have been studied by the Bragg light diffraction method in the frequency range from 0.4 to 1.6 GHz. The results were used to determine the real and imaginary elastic constants for these crystals, which can be used to construct the acoustic attenuation surfaces. It is shown that lanthanum gallosilicate crystals are characterized by relatively high anisotropy of attenuation coefficient of acoustic waves. The observed effect is explained by the strong dependence of the effective Gruneisen constant on the direction of the wave vector.
Keywords:
Acoustic wave, Anisotropy of attenuation, Gruneisen constant, Lanthanum gallosilicate crystals, Real and imaginary elastic constants, Bragg diffraction method.
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