Stoichiometry and structure of copper-doped LiNbO3 and LiTaO3
Abstract
Phase diagram studies in the systems Li2O–Nb2O5–Cu–O and Li2O–Ta2O5–Cu–O show that, at 1000 °C, Cu enters the LiNbO3, LiTaO3 structures primarily as CuI; the main doping mechanism is Li+⇌ Cu +. Rietveld refinement of X-ray powder diffraction (XRD) data of Cu-doped LiNbO3 shows that Cu+ occupies the Li site and this is further confirmed by extended X-ray absorption fine structure (EXAFS) data for Cu-doped LiNbO3 and LiTaO3.