NDLI: Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

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Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Content Provider	MDPI
Author	Sidorov, Nikolay Teplyakova, Natalia Makarova, Olga Palatnikov, Mikhail Titov, Roman Manukovskaya, Diana Birukova, Irina
Copyright Year	2021
Description	Defect structure of nominally pure lithium niobate crystals grown from a boron doped charge have been studied by Raman and optical spectroscopy, laser conoscopy, and photoinduced light scattering. An influence of boron dopant on optical uniformity, photoelectrical fields values, and band gap have been also studied by these methods in LiNbO3 crystals. Despite a high concentration of boron in the charge (up to 2 mol%), content in the crystal does not exceed 10−4 wt%. We have calculated that boron incorporates only into tetrahedral voids of crystal structure as a part of groups [BO3]3−, which changes O–O bonds lengths in O6 octahedra. At this oxygen–metal clusters MeO6 (Me: Li, Nb) change their polarizability. The clusters determine optically nonlinear and ferroelectric properties of a crystal. Chemical interactions in the system Li2O–Nb2O5–B2O3 have been considered. Boron, being an active element, structures lithium niobate melt, which significantly influences defect structure and physical properties of a crystal grown from such a melt. At the same time, amount of defects NbLi and concentration of OH groups in LiNbO3:B is close to that in stoichiometric crystals; photorefractive effect, optical, and compositional uniformity on the contrary is higher.
Starting Page	458
e-ISSN	20734352
DOI	10.3390/cryst11050458
Journal	Crystals
Issue Number	5
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-04-21
Access Restriction	Open
Subject Keyword	Crystals Lithium Niobate Doping Melt Raman Spectroscopy Photoinduced Light Scattering Photoelectric Fields Ir-spectroscopy Optical Spectroscopy Laser Conoscopy
Content Type	Text
Resource Type	Article

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