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.
|頁（從 - 到）||7159-7162|
|期刊||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版狀態||已發佈 - 2007 十月 22|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)