Features of the Defect Structure of the Compositionally Homogeneous Crystal LiNbO₃:Er³⁺(3.1 wt%) and the Gradient Crystal LiNbO₃:Er³⁺ and Their Manifestation in the IR Transmission Spectra in the Region of Stretching Vibrations of Hydrogen Atoms of OH^--Groups.

The presence of hydrogen in the structure of the LiNbO 3 crystal leads to the formation of complex defects: V Li -OH, Nb Li -OH, Me-OH, Me-OH-Me, etc., and to a change in its nonlinear optical and ferroelectric characteristics, affecting such practically significant properties of the LiNbO 3 crystal as photoluminescence, photorefractive thermal fixation, dark conductivity and photorefractive sensitivity [ 41 ].

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