Impact of a Dopant Impurity Electronic Structure on Physical Properties, Defect Structure, and Features of Lithium Niobate Doping Technology

Макарова, О. В.; Палатников, М. Н.; Biryukova, I. V.; Сидоров, Н. В.

doi:10.1134/s1063784219120168

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…Strictly speaking, when any dopant is introduced into a congruent LN melt, it ceases to be congruent. This, in particular, means that the spectrum of variations of ionic complexes in the melt in terms of structure and components greatly increases [ 31 ]. The capture of the melt during crystallization occurs in a limited zone near the crystallization front, where temperature is constant.…”

Section: Resultsmentioning

confidence: 99%

“…The capture of the melt during crystallization occurs in a limited zone near the crystallization front, where temperature is constant. Thus, the only complexes that will crystallize are those for which the temperature is solidus (T C1 ), of course, considering some overcooling [ 31 ]. As some melt volume is used, concentrations of other ion complexes in the rest melt part change.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…Results obtained in [77] based on the analysis of the dopant electronic structure are important for predicting the technological conditions of growth and the quality control of doped LN crystals. At this, p-elements (non-metals, in our case, boron), which have a higher chemical activity due to the greater number of valence electrons than that of metals, make the melt more homogeneous at the level of ionic complexes.…”

Section: Chemical Interactions In Systems Li2o-nb2o5 Li2o-b2o3-nb2o5;...mentioning

confidence: 99%

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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“…The reaction of cerium Ce and zinc Zn has a more violent character that is typical for cerium. The reaction at high temperatures during local heating and consequent fusion of two powders provide a bright flash and a powerful explosion [157,158].…”

Section: Mediummentioning

confidence: 99%

Reviews and Advances in Materials Processing

2022

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among the top 2.5% by ResearchGate and the top 1% in Stanford's list of researchers. To his credit are (i) the disintegrated melt deposition technique and (ii) hybrid microwave sintering technique, an energy efficient solid-state processing method used to synthesize alloys/microcomposites/nanocomposites. He has published over 600 peer-reviewed journal papers, co-authored 8 books, and owns 2 US patents. vii Citation: Gupta, M. Editorial for the Special Issue "Reviews and Advances in Materials Processing".

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Impact of a Dopant Impurity Electronic Structure on Physical Properties, Defect Structure, and Features of Lithium Niobate Doping Technology

Cited by 8 publications

References 15 publications

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

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

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Reviews and Advances in Materials Processing

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