Abstract
The ordering of the host and impurity cations in nominally pure (with different values of Li/Nbratio) and doped lithium niobate crystals is studied using Raman spectroscopy. It is shown that depending on the composition-controlled ordering of structural units of the cationic sublattice the crystal may exhibit, in the region of bridge stretching vibrations of the oxygen ions, either single-mode or two-mode behavior. The nominally pure lithium niobate crystals show, within the homogeneity region, single-mode behavior, while the crystals doped with divalent or trivalent cations show single-mode behavior at low concentrations of the dopant and two-mode behavior at higher concentrations.
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Translated from Optika i Spektroskopiya, Vol. 92, No. 5, 2002, pp. 780–783.
Original Russian Text Copyright © 2002 by Sidorov, Palatnikov, Mel’nik, Kalinnikov.
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Sidorov, N.V., Palatnikov, M.N., Mel’nik, N.N. et al. Two-mode nature of the Raman spectrum of lithium niobate crystals. Opt. Spectrosc. 92, 715–718 (2002). https://doi.org/10.1134/1.1481137
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DOI: https://doi.org/10.1134/1.1481137