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The conditions for the incorporation of OH− ions on O– ion lattice sites and on interstitial sites are derived from the Li/Nb ratio and an anti‐Frenkel disorder of the LiNbO3 crystals. OH− ions substituting O– ions cause an absorption band at 2.865 μm and have a mobility of v(OHo−) = = 400 KT−1 exp (−13120 K/T) cm2/Vs. OH− ions on interstitial sites show the vibrational absorption band at 2.875 μm. Their mobility is higher than that of the OHo− ions: v(OHi−) = = 670 KT−1 exp (−12540 K/T) cm2/Vs. The absorption bands at 2.865 and 2.875 μm are connected with very weak absorptions at 2.248 and 2.255 μm, respectively. The results are discussed and compared with those for Ba2NaNb5O15 crystals.

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