| Lithium niobate(LN) crystal is a kind of ferroelectric oxide materials with high spontaneous polarization intensity and the most highest Curie temperature(1210℃) in the present.It exhibits outstanding ferroelectric,photorefractive,piezoelectric,acoustic-optical, electro-optical and non-linear optical properties and play an active role in sound SAW sensors, optical communication,filters and so on.It is known as "smart" and "universal-type" crystals. Lithium niobate is suitable for production of a variety of light control coupling and transmission components,such as:optical modulation,optical waveguides,optical amplification,optical isolation devices.Due to quantum confinement effect,nanowires and nano-particles possess excellent electrical and optical properties and exhibit attractive prospect in the electrical,optical components area,so it is invaluable to prepare Lithium niobate nanostructured materials.Different kinds of Lithium niobate micro/nanostructured materials were successfully synthesized using LiOH·H2O,Nb2O5 and KOH as starting materials by a hydrothermal route, such as nano-layer structure,nanotube arrays and micro/nanowires.Regularly sized LiNbO3 micro/nanowires have been prepared via introducing KOH and Al2O3 substrate in the hydrothermal reaction system.Chemical grade KOH,LiOH·H2O and Nb2O5 powder with the mole ratio of them being 11:2:1.Phase-pure single-crystalline hexagonal LiNbO3 micro/nanowires with distorted perosvkite structure were obtained and grow along the [110]crystallographic direction.The syntheized micro/nanowires are of diameters typically in the range of 400-1000nm and lengths ranging from several micrometers to several tens of micrometers.At the same time,the formation mechanism of the LiNbO3 micro/nanowires has been discussed.Moreover,we have studied the optical waveguide performances of the LiNbO3 micro/nanowires,and found that they have good waveguide properties for the lights with wavelength of 1064 nm,650nm(red) or 532nm(green).
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