Simulations of the nuclear magnetic resonance spectra of 93Nb nuclei were performed for various models of intrinsic defects in single crystals of the congruent phase. It was shown that the most probable defects were complex (NbLi + 3VLi) and isolated VLi.

NMR Study of Intrinsic Defects in Congruent Lithium Niobate. A.Yatsenko, H.Maksimova, N.Sergeev: Crystal Research and Technology, 1999, 34[5-6], 709-13