OH- Absorption of Zn-Doped LiNbO3 Single Crystals after Proton Exchange

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概要

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• 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.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2007-10-30

著者

• Chia Chih-ta

  Department Of Physics National Taiwan Normal University

• Lin Sheng-hsien

  Institute Of Atomic And Molecular Sciences Academia Sinica

• Liu Hsiang-lin

  Department Of Physics National Taiwan Normal University

• Hu Ming-Li

  R&D Department, Tera Xtal Technology Corporation, Yangmei Jen, Taoyuan, Taiwan, R.O.C.

• Tsai Pei-Chang

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.

• Chang Pi-Jung

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.

• Lu Hsiu-Feng

  Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan 115, R.O.C.

• Liu Hsiang-Lin

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.

• Lin Sheng-Hsien

  Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106, R.O.C.

• Chia Chih-Ta

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.

• Hu Ming-Li

  R&D Department, Tera Xtal Technology Corporation, Yangmei Jen, Taoyuan, Taiwan, R.O.C.

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