Geodesic
The influence of diffusion on the ultrasonic absorption in AT-quartz
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1987), pp. 81-87.

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The effect of diffusion of Li$^+$, K$^+$, Ni$^{3+}$ impurities on the ultrasonic absorption in AT-quartz has been studied. The diffusion of impurities suppresses the relaxational absorption peaks and forms new peaks due to Li$^+$, K$^+$. For $\varepsilon>10^{-4}$ the diffusion by Li$^+$, K$^+$ leads to increasing while the diffusion by Ni$^{3+}$ to decreasing of AT-quartz plasticity. 
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S. V. Karapetyan; A. N. Tselebrovskiy; A. A. Durgaryan. The influence of diffusion on the ultrasonic absorption in AT-quartz. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1987), pp. 81-87. http://geodesic.mathdoc.fr/item/UZERU_1987_1_a12/

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