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The authors say on page 6: "It is well known that in neair-stoichiometric LiNbO3 crystals the peaking OH- vibrational frequency should appear around 3466 cm-1 , corresponding to the complex of HLi-OH." This is not well known at all. Reference? A H-OH defect would be a H2O molecule, but its presence in LiNbO3 has not been demonstrated to my knowledge.

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