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We studied the electric quadrupole interactions of Oxygen isotopes in a TiO 2  single crystal. For  13 O and  19 O nuclei, quadrupole coupling constants were measured by the β-NMR technique, and for the  17 O nucleus the FT-NMR technique was utilized. We synthesized a TiO 2  single crystal which was enriched in  17 O up to 5 atom % to observe NMR signals without any perturbations from impurities. Using the known quadrupole moment of  17 O, EFGs at an O site in TiO 2  and the quadrupole moments of  13 O and  19 O were determined.

NMR Detection of Oxygen Isotopes in TiO 2 Single Crystal