Abstract
The methods of optical, electron, and atomic force microscopy (AFM) are applied to the study of the real structure of optical lithium fluoride ceramic obtained by hot deformation of single crystals. A comparative analysis is carried out of the scattering mechanisms of weakly nonequilibrium thermal phonons at liquid helium temperatures in LiF single crystals and ceramics. It is demonstrated that the phonon scattering in the original single crystals is determined by the forced vibrations of dislocations in the stress field of an elastic plane wave (a phonon), i.e., by the flutter mechanism. As the degree of deformation of the original material increases, the ceramics exhibit a change in the plastic deformation mechanisms, which leads to a decrease in the average size of grains and to an ordered structure. In this case, the dominant scattering is that by intergrain boundaries. The thickness and the acoustic impedance of these boundaries are evaluated.
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Original Russian Text © E.N. Khazanov, A.V. Taranov, R.V. Gainutdinov, M.Sh. Akchurin, T.T. Basiev, V.A. Konyushkin, P.P. Fedorov, S.V. Kuznetsov, V.V. Osiko, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 137, No. 6, pp. 1126–1132.
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Khazanov, E.N., Taranov, A.V., Gainutdinov, R.V. et al. A study of the structure and scattering mechanisms of subterahertz phonons in lithium fluoride single crystals and optical ceramics. J. Exp. Theor. Phys. 110, 983–988 (2010). https://doi.org/10.1134/S1063776110060087
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DOI: https://doi.org/10.1134/S1063776110060087