The structure perfection studies of LiCaAlF6 crystals by laser acoustics technique

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Abstract

The acoustic properties of LiCaAlF6 crystals and the annealing procedure impact on them were studied. The velocities of longitudinal and shear ultrasonic waves along the direction of the optical c-axis of the crystals were measured by laser acoustics, and the mechanical constants were determined: modules of elasticity, all-round compression, shear, and Poisson's ratio. It has been established that the attenuation coefficient of ultrasonic waves in the 1-15 MHz frequency range can serve as a characteristic of the optical perfection of the crystals. The effect of ultrasonic annealing of LiCaAlF6 crystal samples under prolonged exposure by pulsed ultrasound was discovered.

About the authors

E. B Zheleva

Kazan (Volga region) Federal University;Kazan E. K. Zavoisky Physical-Technical Institute

Email: stillsennin@mail.ru
Казань, Россия

V. V Semashko

Kazan (Volga region) Federal University;Kazan E. K. Zavoisky Physical-Technical Institute

Email: ua4pcy@mail.ru
Казань, Россия

A. A Shaveliev

Kazan (Volga region) Federal University

Казань, Россия

O. A Morozov

Kazan (Volga region) Federal University;Kazan E. K. Zavoisky Physical-Technical Institute

Казань, Россия

V. M Kyashkin

Kazan (Volga region) Federal University

Казань, Россия

A. A Karabutov

Kazan E. K. Zavoisky Physical-Technical Institute

Yu. P Brodnikovsky

Kazan E. K. Zavoisky Physical-Technical Institute

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