Research on defects and domain characteristics of MgO-doped near-stoichiometric lithium tantalate in room-temperature polarization process
Research on defects and domain characteristics of MgO-doped near-stoichiometric lithium tantalate in room-temperature polarization process作者机构：School of Astronautics Harbin Institute of Technology Harbin 150001 China
出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)
年 卷 期：2010年第55卷第1期
页 面：11-15页
核心收录：
学科分类：080503[工学-材料加工工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：supported by CTEC (Grant No. 0708031)
主 题：钽酸锂晶体 近化学计量比 边缘缺陷 镁掺杂 多极化 计量室 氧化镁 进程
摘 要：MgO-doped congruent and near-stoichiometric lithium tantalate single crystals were grown by Czochralski technique and flux method respectively. Optical absorption studies showed that the UV absorption edge was very sensitive to the composition of the crystals and the decrease in defects led to the blue-shift of the UV-edge. The unit domain shape also related to the composition, and the observed results of the crystal wafers that etched by hydrofluoric acid indicate that the domain structure of near- stoichiometric lithium tantalate is hexagonal. Domain movement characteristics in the room-temperature polarization process and the asymmetry between the domain walls of periodically poled lithium tantalate crystals are discussed in detail. Room-tempera- ture polarization experiment of the grown crystal wafers with 1.8 mm thickness was carried out and periodical structures were obtained.
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