Eur. Phys. J. B 43, 347-353 (2005)
https://doi.org/10.1140/epjb/e2005-00062-2

The H⁺ related defects involved in domain reversal for both near-stoichiometric and heavily Mg-doped lithium niobate crystals

¹ R&D Center for Photon-Electro materials, Nankai University, Tianjin 300071, China
² Photonics Center, College of Physical Science, Nankai University, Tianjin 300071, China

Corresponding author: ^a fls@mail.nankai.edu.cn

Received: 27 July 2004
Published online: 15 March 2005

Abstract

Domain reversal was performed on both near-stoichiometric and heavily Mg-doped lithium niobate crystals. H⁺ related defect structures in these two types of crystals were studied through the infrared absorption spectra. It is found that the intensity of some decomposed peaks of absorption band change apparently during domain reversal for near-stoichiometric lithium niobate crystals but not for heavily Mg-doped lithium niobate crystals. According to these experimental results, distinct models about H⁺ related defect structure in LiNbO₃ lattice were supposed for them. Nb and Mg were considered as the centers of H⁺ related defect complex for near-stoichiometric and heavily Mg-doped lithium niobate crystals respectively. Different behavior of them was used to explain the difference of infrared absorption spectra during domain reversal between two types of crystals.