Research on the Fabrication of X-Cut Near Stoichiometric Lithium Niobate Wafers

This article discusses the preparation of twin free X-cut lithium niobate wafers using the diffusion method. The liquid electrode method was used to eliminate parasitic microdomains at dislocations. According to research, the Li-rich lithium niobate polycrystalline material contains (Li0.941Nb0.059) Nb0.9528O3 and Li3NbO4 phases, and the diffused near-stoichiometric lithium niobate wafer exhibits a monodomain state. The piezoelectric coefficient (d33) of near-stoichiometric lithium niobate after eliminating microdomains increased by 12% compared to congruent lithium niobate. The Curie temperature of near-stoichiometric lithium niobate wafers can reach 1198 °C, and the UV absorption spectrum of near-stoichiometric lithium niobate is blue shifted by 10 nm compared to congruent lithium niobate wafers, making it more suitable for fabricating electro-optic and micro nano electronics devices.