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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...

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Detalles Bibliográficos
Autores principales: Smirnov, Maxim, Manukovskaya, Diana, Sidorov, Nikolay, Palatnikov, Mikhail
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
Descripción
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.