Influence of MgO doping on spontaneous polarization and second-order susceptibility in LiNbO3 crystals

EFFECT OF MgO DOPING ON COERCIVE FIELD IN LiNbO3 CRYSTALS

“…14 Our theoretical calculations based on the Li deficit model show that the spontaneous polarization reduces with increasing Mg doping concentration up to a threshold doping level of 4.5 mol%. 15 The same theoretical model could successfully explain our experimental observations on birefringence 16 and second harmonic generation 15 in various MgLN crystals. In the present paper, we aim to explain the striking reduction in coercive field by MgO doping.…”

Growth Optimization and Optical Characteristics of Fe Doped LiNbO3 Crystals

“…In these octahedra the electrons in Li−O bonds are tightly bound to oxygen atom and weakly polarized. Hence, the Li−O bonds are more ionic in character compared to the Nb−O bond, which is covalent in nature and relatively more polarizable. − Further, LiNbO 3 is typically nonstoichiometric material having a high concentration of intrinsic defects (Nb antisites and Li vacancies). The ionic radii of Nb 5+ , Li 1+ and Fe 3+ ions are almost same.…”

Growth and optical homogeneity investigations of Fe and Fe:Mn codoped LiNbO3 crystals

“…LiNbO 3 is typically non-stoichiometric materials having high concentration of intrinsic defects (Nb antisites and Li vacancies). The Li-O bonds are more ionic in character compared to Nb-O bonds, which is covalent in nature and relatively more polarisable [11][12][13]. In LiNbO 3 the segregation coefficients of Mn and Fe are very close to unity and therefore it is expected that the concentration in melt and crystal will be nearly same for the size of the crystal grown in present case.…”