Kinetics of OH- ions in nearly stoichiometric LiNbO3 crystals

K. Lengyel, L. Kovács, Gábor Mandula, Romano Rupp

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Kinetics of the complex OH- stretching vibrational band in a nearly stoichiometric LiNbO3 crystal (Li/Nb ≈ 0.988) has been studied in order to explore the relation between the thermal fixing process of holograms and the hydroxyl ion absorption. By a careful analysis of the spectra we have observed that the intensity of the absorption band components at a given temperature changes with time suggesting that protons migrate among the different sites until they reach a thermodynamic equilibrium. The time dependence of the intensities has been measured at different temperatures between 40-120°C after a heat treatment at 250°C. From the measured data the time constants and the corresponding activation energies (Eav ≈ 1.1 ± 0.1 eV) were determined and compared with those of the thermal fixing process. The results obtained confirm that the hologram fixing process is governed by proton migration in the crystal.

Original languageEnglish
Pages (from-to)255-262
Number of pages8
JournalFerroelectrics
Volume257
Issue number1
DOIs
Publication statusPublished - 2001

Fingerprint

Holograms
fixing
Protons
Ions
Crystals
Kinetics
kinetics
Stretching
crystals
Absorption spectra
ions
protons
Activation energy
Heat treatment
Thermodynamics
thermodynamic equilibrium
Temperature
time constant
time dependence
heat treatment

Keywords

  • activation energy
  • hologram fixing
  • LiNbO crystal
  • OH absorption
  • proton migration

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kinetics of OH- ions in nearly stoichiometric LiNbO3 crystals. / Lengyel, K.; Kovács, L.; Mandula, Gábor; Rupp, Romano.

In: Ferroelectrics, Vol. 257, No. 1, 2001, p. 255-262.

Research output: Contribution to journalArticle

Lengyel, K. ; Kovács, L. ; Mandula, Gábor ; Rupp, Romano. / Kinetics of OH- ions in nearly stoichiometric LiNbO3 crystals. In: Ferroelectrics. 2001 ; Vol. 257, No. 1. pp. 255-262.
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