研究目的
To analyze the influence of [Li]/[Nb] ratios on the defect structure of Sc:Fe:Cu:LiNbO3 crystals using UV-Visible and IR transmission spectra.
研究成果
The defect structure of Sc:Fe:Cu:LiNbO3 crystals changes with [Li]/[Nb] ratios, as evidenced by shifts in UV-Visible absorption edges and variations in IR transmission peaks. The ratio of 1.05 yields near-stoichiometric crystals, while higher ratios introduce new defects such as the OH- peak at 3505 cm-1.
研究不足
The study is limited to specific doping concentrations and [Li]/[Nb] ratios; other ratios or dopants were not explored. The analysis relies on spectral data without additional structural characterization methods.
1：Experimental Design and Method Selection:
The Czochralski method was used to grow Sc:Fe:Cu:LiNbO3 crystals with different [Li]/[Nb] ratios (
2：946, 05, 20, 38). UV-Visible and IR transmission spectra were employed to analyze defect structures. Sample Selection and Data Sources:
Crystals were grown from high-purity raw materials (Sc2O3, CuO, Fe2O3 at
3：99% purity) with specified concentrations. List of Experimental Equipment and Materials:
Equipment includes a CARY2390 UV-Vis spectrophotometer and a Fourier infrared spectrometer (Niconet-710, Nicolet, USA). Materials include Sc2O3, CuO, Fe2O3, and LiNbO3 precursors.
4：Experimental Procedures and Operational Workflow:
Raw materials were mixed, preheated, sintered, and crystals grown with specific pull speeds, rotation rates, and temperature gradients. Crystals were polarized, cut into wafers, and spectra measured.
5：Data Analysis Methods:
Spectra were analyzed to determine absorption edges and OH- vibrational peaks, interpreting defect structures based on energy transitions and ionic valences.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
