Investigation of the Intrinsic Defects of LiTaO3 Crystals by NMR Spectroscopy

Resumo

The nuclear magnetic resonance (NMR) of ⁷Li and ⁶Li nuclei in a LiTaO₃ single crystal sample of congruent composition has been experimentally investigated. It is found that there are weak side lines in the NMR spectra of ⁷Li nuclei, which have not been observed before; these lines are due to cation sublattice defects. A computer simulation of NMR spectra has revealed the most likely configuration of \(({\text{Ta}}_{{{\text{Li}}}}^{{{\text{5}} + }} + {\text{4}}{{V}_{{{\text{Li}}}}})\) defect complexes that are present in nonstoichiometric LiTaO₃ crystals.