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Manifestation of structural features of LiNbO3:Zn and LiNbO3:Mg crystals in their IR absorption spectra in the stretching region of OH– groups

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Abstract

Analysis of IR absorption spectra of LiNbO3:Zn (0.04–4.46 mol % ZnO) and LiNbO3:Mg (0.19–5.91 mol % MgO) single crystals in the stretching region of OH– groups has been used to gain insight into composition-dependent structural changes in the crystals. The results demonstrate that, characteristically, the OH– groups occupy different sites in the doped and congruent LiNbO3 crystals and have different quasielastic O–H bond constants in their structure. In stoichiometric lithium niobate crystals, all of the OH– sites and quasi-elastic O–H bond constants are identical. At threshold Zn and Mg dopant concentrations, the frequencies, widths, and intensities of the observed lines change sharply. The linewidths in the spectra of the LiNbO3:Zn crystals near their first concentration threshold (≈2.0 mol % ZnO) and the LiNbO3:Mg crystals near their first and second concentration thresholds (≈3.0 and 5.5 mol % MgO) decrease markedly, indicating ordering of the position of the OH– groups in the structure of the crystals.

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center, Russian Academy of Sciences, Akademgorodok 26a, Apatity, Murmansk oblast, 184209, Russia

    N. V. Sidorov, M. N. Palatnikov & L. A. Bobreva

  2. Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya ul. 5, Troitsk, Moscow, 108840, Russia

    N. N. Novikova

Authors
  1. N. V. Sidorov
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  2. M. N. Palatnikov
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  3. L. A. Bobreva
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  4. N. N. Novikova
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Correspondence to N. V. Sidorov.

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Original Russian Text © N.V. Sidorov, M.N. Palatnikov, L.A. Bobreva, N.N. Novikova, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 7, pp. 727–731.

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Sidorov, N.V., Palatnikov, M.N., Bobreva, L.A. et al. Manifestation of structural features of LiNbO3:Zn and LiNbO3:Mg crystals in their IR absorption spectra in the stretching region of OH– groups. Inorg Mater 53, 713–717 (2017). https://doi.org/10.1134/S0020168517070172

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  • DOI: https://doi.org/10.1134/S0020168517070172

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