1 Growth and Properties of Ru Doped Lithium Niobate Crystal
نویسندگان
چکیده
Ruthenium (Ru) doped lithium niobate (LiNbO3) single crystal was grown by the Czochralski method from a congruent melt composition. The color of the Ru: LiNbO3 was red and darkened with the increasing Ru concentration. The amount of Ru concentrated in the grown crystal gradually decreased along the pulling direction because the effective segregation coefficient of Ru in lithium niobate is greater than one, and also because RuO2 evaporated during the crystal growth period. However, a solubility limit does exist in Ru: LiNbO3 crystals, so the maximum amount of Ru doped into LiNbO3 single crystals is about 0.2 mol%. In addition, the lattice constants of Ru: LiNbO3 on the Aand C-axis decreased with the concentration of Ru in lithium niobate. The absorption spectra examination of Ru: LiNbO3 showed that there were two absorption peaks around 370nm and 530nm that is within the UV/VIS region. The absorption coefficients should increase, and the absorption edges shift toward longer wavelength as the Ru concentration increases. The OH absorption spectra proved that Ru ions would first occupy NbLi sites in congruent LiNbO3. PACS: 64.75.+g; 78.20.-e; 81.10.Fq
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