Acoustic properties of Dy2S3 thcck films at high frequencies

Bragg light diffraction on hypersonic acoustic waves in lithium niobate crystals has been used for determination of acoustic properties of Dy <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> thick films. The investigations have been realized for determination of the velocity and attenuation coefficient of transversal acoustic waves in the Dy <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> thick film at frequency range from 0.4 to 1.0 GHz. and at temperatures 20 and 40 degrees centigrade. The frequency dispersion of the transversal wave's velocity in Dy <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> crystals has been detected in the investigated frequency range.

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