Lattice parameters and curie temperature of sintered magnesium doped lithium niobate

Lattice parameters, ferroelectric Curie temperature (Tc) and density of sintered MgO doped LiNbO 3 were evaluated for investigating the substitution mechanism of Mg in LiNbO 3 crystal. The variations in the hexagonal lattice parameters, Tc and the density of specimens were changed with MgO concentration. It is likely that the substitution of Nb on the Li-sites by Mg occurs dominantly below 4 mol% MgO concentration, then substitution of Li by Mg begins to occur above 4 mol%.