Low-temperature Raman study of zinc-doped lithium niobate crystal powders

M. L. Hu, C. T. Chia, J. Y. Chang, W. S. Tse, J. T. Yu

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14 Citations (Scopus)

Abstract

Low-temperature (10 K) Raman scattering was used to examine powder samples ground from congruently grown Zn-doped lithium niobate crystal. The Raman lineshapes clearly showed three major variations in phonon frequency and half width, at the 279, 335, 580 and 633 cm-1 Raman peaks. The change in phonon lineshapes is barely noticeable below 5 mol% Zn doping. Above this value of doping, the phonon frequency sharply decreased and the half width increased. Both reached extreme values at approximately 7.5 mol% doping. Phonon frequency dramatically increased and half width decreased at doping concentrations above 7.5 mol%. Based on the Li-vacancy model, we suggest that Zn atoms entered Li sites and fewer Nb atoms replace Li atoms at doping concentrations below 5 mol%. Above 5 mol% Zn doping, replacement of the Li atom by the Nb atom is unlikely. Zn atoms begin to enter the Nb sites at a concentration of approximately 7.5 mol%. The concentration of Li vacancies decreases rapidly at doping over 7.5 mol%.

Original languageEnglish
Pages (from-to)358-362
Number of pages5
JournalMaterials Chemistry and Physics
Volume78
Issue number2
DOIs
Publication statusPublished - 2003 Feb 17

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Keywords

  • Li atoms
  • Low-temperature Raman study
  • Zinc-doped lithium niobate

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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