This work demonstrates that nonmetal boron is absent in the crystal structure thus it structures the melt and has a significant influence on the structure and physical characteristics of lithium niobate crystals. At this LiNbO_3:B crystals possess a structure uniformity (and it is higher than that of a congruent crystals), their Nb_(Li) defects amount is close to the amount in stoichiometric crystals though a photorefractive effect of LiNbO_3:B crystals is much lower than in stoichiometric crystals and the structure and an optical uniformity is higher in LiNbO_3:B crystals.
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