The OH− absorption spectra of low doped lithium niobate crystals

Kong, Yong; Zhang, Wanlin; Xu, Jingjun; Yan, Wenbo; Liu, Hongde; Xie, Xiang; Li, Xiaochun; Shi, Lihong; Zhang, Guangyin

doi:10.1016/j.infrared.2003.12.001

Cited by 15 publications

(5 citation statements)

References 36 publications

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“…VLi are absent from SLN crystal structure. This means that IR spectrum should not c bands with frequencies 3480-3485 cm -1 , which is confirmed experimentally [29 spectra of LiNbO3:B (0.55-0.83 mol%) is similar to those of CLN: an OH-groups abso band is split in three components of the same polarization ~3470, ~3483, and ~348 Thus, hydrogen bonds in CLN and LiNbO3:B crystals structure should be similar components of CLN crystal are considered to be connected with stretching vibrat OH groups located near NbLi 4+ -VLi − defects [53,55]. However, intensities of all thre ponents are higher in LiNbO3:B than in CLN spectrum, Table 2.…”

Section: Study Of Linbo 3 :B Crystal Structure By Ir Spectroscopy In ...supporting

confidence: 62%

“…Thus, hydrogen bonds in CLN and LiNbO 3 :B crystals structure should be similar. Three components of CLN crystal are considered to be connected with stretching vibrations of OH groups located near Nb Li 4+ -V Li − defects [53,55]. However, intensities of all three components are higher in LiNbO 3 :B than in CLN spectrum, Table 2.…”

Section: Study Of Linbo 3 :B Crystal Structure By Ir Spectroscopy In ...mentioning

confidence: 99%

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Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

et al. 2021

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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.

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Section: Study Of Linbo 3 :B Crystal Structure By Ir Spectroscopy In ...supporting

confidence: 62%

Section: Study Of Linbo 3 :B Crystal Structure By Ir Spectroscopy In ...mentioning

confidence: 99%

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

et al. 2021

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“…This optical behavior of LiNbO 3 :B crystals is similar to the behavior of strongly doped LiNbO 3 :Zn and LiNbO 3 :Mg crystals. Photorefractive effect is suppressed in LiNbO 3 :Zn and LiNbO 3 :Mg crystals doped with near- or after-threshold concentrations [ 24 , 25 , 26 , 27 , 28 , 29 ]. Only round scattering of laser beam on static structure defects is observed in both LiNbO 3 :B and LiNbO 3 :Zn, LiNbO 3 :Mg crystals.…”

Section: Resultsmentioning

confidence: 99%

Growing, Structure and Optical Properties of LiNbO3:B Crystals, a Material for Laser Radiation Transformation

et al. 2023

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Physical and chemical properties have been studied in lithium niobate (LiNbO3, LN) crystals grown by Czochralski from a boron doped melt. Optical uniformity and optical damage resistance of LiNbO3:B crystals have been compared with control crystals of nominally pure congruent (CLN) and near-stoichiometric (NSLN K2O) composition. LiNbO3:В crystals structure has been studied. Studied LiNbO3:В crystals have been grown from differently synthesized charges. The charges have been synthesized from a mixture Nb2O5:B-Li2CO3 using homogeneously doped Nb2O5:B precursor (sample 1, (B) = 0.0034 wt% in the charge) and by a direct solid phase synthesis from Nb2O5-Li2CO3-H3BO3 mixture (sample 2, (B) = 0.0079 wt% in the charge). Only traces of boron (10−5–10−4 wt%) have been detected in the samples. We have established that concentration of anti-site defects NbLi is lower in both LiNbO3:B than in CLN crystals. XRD analysis has confirmed that В3+ cations localize in faces of tetrahedral voids О4 of LN structure. The voids act as buffers at the anion sublattice distortion. Sample 1 has been shown to have a structure closer to NSLN K2O crystal than sample 2. We have also shown that the chemical purity of LN crystal increases compared to the melt purity because boron creates strong compounds with impurities in the melt system Li2O-Nb2O5-B2O3. Metals impurities thus stay in the melt and do not transfer to the crystal.

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“…Most doping ions occupy Li-sites when the doping concentrations are below the thresholds [29]. The reported thresholds for divalent and trivalent ions are about 5.5 and 2.5 mol%, respectively [30]. The absorption peak does not shift when the doping concentration is below the threshold.…”

Section: Article In Pressmentioning

confidence: 95%