Comments on the defect chemistry of magnesium-doped lithium niobate (LiNbO{sub 3})
- Univ. of Osnabrueck (Germany)
Congruently grown LiNbO{sub 3} is known to be highly defective due to its significant Li{sub 2}O deficiency. At present, two stoichiometry-related defect-chemical models are discusses which can be distinguished with respect to the occurrence of Li or Nb vacancies. The Nb-vacancy model takes advantage of ilmenite-structured LiNbO{sub 3} and predicts a niobium antisite concentration being at least five times as large as in the Li-vacancy model. In the present contribution, it is argued that the magnesium-doping mechanisms are essentially independent of these particular differences. It is argued that extended stoichiometry-related defect clusters represent a key for a proper understanding of the defect chemistry of impurity cations. The discussion is mainly based on recent shell-model simulations of perfect and defective LiNbO{sub 3}.
- OSTI ID:
- 501787
- Journal Information:
- Journal of Solid State Chemistry, Vol. 123, Issue 2; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stability of intrinsic defects and defect clusters in LiNbO{sub 3} from density functional theory calculations
Growth, defect structure, and THz application of stoichiometric lithium niobate