Optical properties of ferroelectric lanthanum lithium niobate. Issue 5 (1st April 2018) - Diaz-Moreno, Carlos A.
Abstract: Fine structures (ferroelectric domains), ferroelectricity and Second Harmonic Generation results were found and studied as a function of laser linearly and circularly polarization dependent polarized excitations in ferroelectric stoichiometric La0.05 Li0.85 NbO3 nanocrystals ceramic material. Scanning Electron Microscope images are taken as a comparison to Second Harmonic Generation intensity profiles revealed fine structures. By using laser polar measured response we are able to find the angle orientation from 0° to 90° angles of ferroelectric domains with highly good definition contrast obtained in blue/gray colors. It shows ferroelectric hysteresis loops at room temperature with a polarization saturation of (0.247 μC/cm 2 ), remnant polarization of (0.15 μC/cm 2 ) and coercitivity field of (1.31 kV/cm). X-ray Diffraction, Atomic Force Microscope, Raman spectroscopy and X-ray Photoelectron Spectroscopy, revealed well formed of ferroelectric ABO3 perovskite crystal structure, piezoelectric image response indicate ferroelectric pattern domain structure, new vibrations modes on LaO6, LiO6 and NbO6 octahedral sites and binding energies of electronic structure of La 57, Nb 41, O 8, Li 3 from the surface of the ferroelectric stoichiometric La0.05 Li0.85 NbO3 nanocrystals ceramic material, respectively.