Preparation and charactrization of photonic LiNbO_3 generated from mixing of new raw materials using spry pyrolysis method

摘要

Nano and micro Lithium niobate (LiNbO_3) are deposited on quartz substrates using the spray pyrolysis technique. Li_2CO_3, Nb_2O_5, Citric Acid and Ethylene Gly-col are employed as the precursor compounds. The films are annealed at different temperatures, i.e. room temp., 400, 500 and 600 ℃. The LiNbO_3 are characterized by FE-SEM, X-ray diffraction and analyzed by UV-visible and photoluminescence. Grain size decreases as annealing temperatures increase. The energy band gap approaches 3.9 eV when the annealing temperature increases. Optical investigations of the band gap, refractive index and extinction coefficient are also elaborated. The results showed that the transmission is in the range 43-78 %.