摘要：Lithium niobate (LiNbO3) crystal, used in many optical fields, has been of great interest for fundamental science and applications in optics for many years due to its excellent ferroelectric properties such as piezoelectricity, pyroelectrical, electro-optical, photorefractive and nonlinear-optical properties. Several methods for synthesizing lithium niobate crystal have been reported, for instance Czochralski growth, top seeded solution growth (TSSG), liquid phase epitaxy,laser deposition, chemical vapor deposition and sol-gel and so on. Although these methods have many advantages, they also have some disadvantages. For example, Lithium ethoxide and Niobium ethoxide are the most common reactants in sol-gel method. But, it is known to all that they are unstable in air and water. So, we have to take the course under the protection of N2 gas. This drawback complicates the process considerably.In this paper, LiNbO3 crystal was successfully prepared via a simple and convenient hydrothermal route using LiOH and Nb2O5 (molar rate=2:1) as the starting reactants. The whole reaction process was carried in an autoclave made by us, showed in fig. 1. The typical procedure was described as follow: first, distilled water was poured into the autoclave until 50% to 80% of its volume was filled. Then the reagents were added in succession. After that, the autoclave was sealed and maintained at 260℃ for 72 hours and then cooled to room temperature naturally. The obtained sample was washed with distilled water and absolute alcohol for several times to remove the by-products and other impurities. After drying, the obtained sample was characterized by XRD and IR.XRD patterns of the as-prepared sample showed that the sample was well crystallized and of high purity. All the major reflection peaks were appeared and accorded with the reported data in the literature. In addition, no other impurities, such as Nb2O5 and Li3NbO4, were detected in the sample.The as-prepared sample was dispersed into paraffine and characterized using IR spectr

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