Hydroxyl ion absorption in LaGaO3 single crystals

L. Kovács, K. Lengyel, A. Baraldi, R. Capelletti, M. Berkowski, W. Ryba-Romanowski

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Abstract

LaGaO3 single crystals have been studied by means of Fourier transform infrared (FTIR) absorption spectroscopy in the range of OH-/OD- stretching vibrations. A single narrow absorption line has been detected at low temperatures down to T = 9 K in most of the as grown crystals at about 3521 cm-1. An abrupt decrease of the vibrational frequency has been observed at the orthorhombic-rhombohedral structural phase transition temperature (Tc=418 K). The temperature dependence of the frequency and the linewidth of the absorption line below the phase transition have been analysed by using the single phonon-coupling model. The parameters of the anharmonic potential of the OH- stretching vibration have been determined by three different methods (xe = 0.02272 and ωe = 3688.64 cm-1 as calculated from the second harmonic) and found to be in agreement with those measured for hydroxyl ions in other oxide crystals. Additional OH-/OD- absorption lines have been detected in a few LaGaO3 crystals treated in H2O/D2O vapours.

Original languageEnglish
Pages (from-to)741-747
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume64
Issue number5
DOIs
Publication statusPublished - May 1 2003

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Keywords

  • A. Oxides
  • C. Infrared spectroscopy
  • D. Anharmonicity
  • D. Defects
  • D. Phase transitions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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