OH- absorption of Zn-doped LiNbO3 single crystals after proton exchange

Pei Chang Tsai, Hsiu Feng Lu, Pi Jung Chang, Chi-Ta Chia, Hsiang Lin Liu, Sheng Hsien Lin, Ming Li Hu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

An investigation of the OH- absorption spectra of Zn-doped LiNbO3 single crystals with doping concentrations from 0.0 to 8.3 mol % after proton exchange (PE) is carried out. Before PE treatment, the absorption bands are found centered at approximately 3485 cm-1 for the samples with Zn-doping concentrations below 7.5 mol %, whereas two distinct bands at 3505 and 3530 cm-1 are clearly observed for the samples with Zn-doping concentrations above 7.5 mol %. After PE treatment, an absorption band at 3505 cm-1 is predominant for all the samples, and this is attributed to the high concentration of H+ ions substituting Li atoms. However, for the highly Zn-doped samples, the lineshape and intensity of the 3530 cm-1 mode remain the same during PE. A theoretical investigation using the hybrid density functional B3LYP method with a simple cluster structure shows that the origins of the 3485 and 3530 cm-1 absorption modes correspond to the Li- and Nb-vacancy models, respectively.

Original languageEnglish
Pages (from-to)7159-7162
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number10 B
DOIs
Publication statusPublished - 2007 Oct 22

Keywords

  • B3LYP calculation
  • LiNbO
  • Nb-vacancy model
  • OH absorption
  • Proton exchange

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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