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Vol. 246, Issue 7, November 2020, pp. 43-47

 

Bullet

 

Attenuation of Acoustic Waves in Single-domain and Polydomain LiTaO3 Crystals
 

1, * Farkhad AKHMEDZHANOV, 1 Jakhongir KURBANOV and 2 Azizbek BOLTABAEV

1 Institute of ion-plazma and laser technology, 33 Durmon yuli street, Tashkent, 100125, Uzbekistan
2 Institute of Nuclear Physics, INP, Ulugbek settlement, Tashkent, 100124, Uzbekistan
1 Tel.: 998-902121998, fax: 998-712623183

E-mail: akhmedzhanov.f@gmail.com

 

Received: 23 October 2020 /Accepted: 24 November 2020 /Published: 30 November 2020

Digital Sensors and Sensor Sysstems

 

Abstract: The frequency dependence of the attenuation of longitudinal and transverse acoustic waves along the 100 and 1 directions in single-domain and polydomain lithium tantalate crystals at room temperature has been investigated. In the frequency range 0.150.4 GHz, the measurements were carried out by the modified Williams-Lamb pulse interference method. At frequencies of 0.41.8 GHz, the studies were performed by the Bragg diffraction of light on the acoustic waves. It is shown that the quadratic dependence of the attenuation on frequency is fulfilled in single-domain LiTaO3 samples. Based on the results all the six independent real and imaginary components of the complex elastic tensor for LiTaO3 crystals have been determined. The obtained values of these components were used to determine the velocity and attenuation coefficient of acoustic waves along other directions. It is also shown, that there is an interrelationship between the orientation dependences of the velocity and attenuation of acoustic waves. A strong increase in the attenuation coefficient of acoustic waves and the violation of the quadratic dependence of the attenuation on frequency in polydomain crystals are ascertained. A resonant mechanism of the attenuation of transverse acoustic waves along the 100 axis associated with the domain microstructure of lithium tantalate crystals was discovered.

 

Keywords: Lithium tantalate crystals, Acoustic wave, Anisotropy of attenuation, Domain structure, Elastic constants.

 

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