To determine the defect structure of ZnO-doped LiNbO3 single crystals with high doping concentrations, measurements were made using extended X-ray absorption fine structure methods at room temperature. It indicated that the Zn atom was directly substituted at the Li site of the LiNbO3 crystal after Zn doping. Extended X-ray absorption fine structure simulation, by analyzing the scattering amplitudes, also showed that the Zn atom did not substitute at the Nb site in highly Zn-doped LiNbO3. Finally, it was confirmed that VNb5-, a strong charged vacancy, should be considered to be an important factor in influencing the physical properties of LiNbO3 beyond 7.5mol%Zn-doped doping.

Defect Structure of Highly Zn-Doped LiNbO3 Single Crystal Revealed by Extended X-ray Absorption Spectra. P.C.Tsai, M.L.Sun, C.T.Chia, H.F.Lu, S.H.Lin, M.L.Hu, J.F.Lee: Applied Physics Letters, 2008, 92[16], 161902