Lattice site of rare-earth ions in stoichiometric lithium niobate probed by OH- vibrational spectroscopy

L. Kovács, Laura Kocsor, Zsuzsanna Szaller, Ivett Hajdara, Gabriella Dravecz, K. Lengyel, G. Corradi

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4 Citations (Scopus)

Abstract

Rare-earth (RE = Er3+, Nd3+, or Yb3+) ion-doped stoichiometric LiNbO3 crystals were grown by the Czochralski and the high-temperature top-seeded solution growth methods. For the 0.22–0.87 mol% concentration range of the RE oxides in the melt/solution, in addition to the well-known hydroxyl (OH) vibrational band in undoped stoichiometric LiNbO3, a new infrared absorption band was observed at about 3500 cm−1, similar to the case of the trivalent optical damage resistant (ODR) dopants In3+ and Sc3+. By comparing the frequencies and polarization dependences of the bands to those detected for ODR ion containing crystals, they are attributed to the stretching vibration of OH ions in RE3+Nb-OH complexes. Consequently, above a given concentration threshold, some of the rare-earth ions are assumed to occupy niobium sites in the LiNbO3 lattice. The same model is also suggested for RE-doped congruent LiNbO3 crystals containing over-threshold (>5 mol %) amounts of the Mg-co-dopant.

Original languageEnglish
Article number230
JournalCrystals
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 1 2017

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Keywords

  • Hydroxyl ions
  • IR spectroscopy
  • Lithium niobate
  • Rare-earth dopants

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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