An Approach To The Defect Structure Analysis Of Lithium Niobate Ilmenite Type Structure

We present in this work a comparative study between the normal and the ilmenite structural of LiNbO 3 . Namely, the normal cation stacking sequence is replaced by the ilmenite ordering: …Nb Li vacancy Li Nb vacancy Nb Li vacancy Li Nb vacancy…. . From Safaryan’s approach which combines a ferroelectric phase transition theory and vacancy models we allows to calculate the Curie temperature in ilmenite LiNbO 3 . Comparatively, we showed that the ilmenite structural LiNbO 3 is in an excellent agreement with experiment result than the normal LiNbO 3