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Hypersonic Wave Attenuation in Yttrium Aluminum Garnet and Gadolinium Gallium Garnet

The velocity and the attenuation of hypersound waves propagating along [100], [110], and [111] axis in gadolinium gallium garnet and along [100] and [111] axis in yttrium aluminum garnet are measured at frequencies 0.714 to 2.106 GHz at the room temperature. The second order elastic constants, Debye temperatures, and the Gruneisen constants are calculated from this results.