Cargando…
Features of the Defect Structure and Luminescence of Nominally Pure Lithium Niobate Crystals Produced Using Different Technologies
We have established that luminescence in lithium niobate crystals both congruent and near-stoichiometric (R ≈ 1) is due to point defects in the cationic sublattice and intraconfigurational transitions in the oxygen-octahedral NbO(6) clusters. We have also determined that the main contribution to the...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9822429/ https://www.ncbi.nlm.nih.gov/pubmed/36614594 http://dx.doi.org/10.3390/ma16010255 |
Sumario: | We have established that luminescence in lithium niobate crystals both congruent and near-stoichiometric (R ≈ 1) is due to point defects in the cationic sublattice and intraconfigurational transitions in the oxygen-octahedral NbO(6) clusters. We have also determined that the main contribution to the luminescence in the visible and near IR regions is made by luminescence centers with the participation of Nb(Li) defects: the Nb(Li)-Nb(Nb) bipolaron pair and the Nb(Li)-O defect in a congruent crystal. The minimum intensity of bipolaron luminescence has been observed in stoichiometric crystals obtained using different technologies. Weak luminescence of the Nb(Li)-Nb(Nb) bipolaron pair indicates a small number of Nb(Li) defects in the crystal structure. The number of Nb(Li) defects in the crystal structure indicates a deviation of the crystal composition from stoichiometry. |
---|