Structural defects of nominally pure congruent and stoichiometric LiNbO3 crystals and a series of congruent crystals doped with 0.91–5.91 mol% MgO were compared and comprised two concentration thresholds at ~3.0 and ~5.5 mol% MgO. The main band parameters of OH stretching vibrations in IR absorption spectra (frequency, half-width, intensity) displayed abrupt changes near the concentration threshold at 5.5 mol% MgO. The OH stretching-vibration band shifted to higher frequency by ~50 cm–1 because of the formation of (MgLi)+–(MgNb)3––OH–complexes upon reaching the second Mg concentration threshold.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 86, No. 4, pp. 510–516, July–August, 2019.
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Sidorov, N.V., Bobreva, L.A. & Palatnikov, M.N. Complex Defects in Mg-Doped Lithium Niobate Crystals Over a Wide Concentration Range and Their Manifestation in IR Absorption Spectra in the OH Stretching Vibration Region. J Appl Spectrosc 86, 572–577 (2019). https://doi.org/10.1007/s10812-019-00861-x
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DOI: https://doi.org/10.1007/s10812-019-00861-x