Laser Brillouin scattering (LBS) is applied to measure the sound velocity and the anisotropic velocity of sound of high-quality single-domain tetragonal Fe: BaTiO_3 single crystals at room temperature. The elastic and piezoelectric constants are thus determined. Based on the sound propagation equations and these results, the directional dependence of the compressional and shear moduli of Fe:BaTiO_3 in the (010) and (001) planes are investigated. Some properties of sound propagation and electromechanical couping in the crystal are discussed.
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