Relationship between the dielectric constant and corresponding defect concentration of lithium niobate crystals was studied. An ion polarizability additivity rule of dielectric constants of complex substances and the Li-site vacancy model were employed in the present work. The obtained linear correlation between the dielectric constant and corresponding defect concentration of lithium niobate crystals presents a novel method to quantitatively characterize the optical quality of the obtained single crystals. The working formula and curve for lithium niobate crystal samples provided a quantitative scale with which to characterize the defect concentration of the obtained lithium niobate single crystals.

Dielectric Characterization of the Defect Concentration in Lithium Niobate Single Crystals. D.Xue, K.Kitamura: Solid State Communications, 2002, 122[10], 537-41