scholarly journals ANALYSIS OF METHODS FOR SYNTHESIS OF A BORON-DOPED LITHIUM NIOBATE CHARGE USED FOR GROWING SINGLE CRYSTALS

2021 ◽  
pp. 750-759
Author(s):  
Софья Михайловна Маслобоева
Keyword(s):  
Lithium Niobate ◽  
Single Crystals ◽  
Solid Phase ◽  
Synthesis Method ◽  
Lithium Carbonate ◽  
Optical Quality ◽  
High Optical Quality ◽  
Boron Doped ◽  
Boron Dopant ◽  
A Charge

Проведен анализ известных методов синтеза шихты ниобата лития, легированной бором, которая используется при выращивании монокристаллов высокого оптического качества методом Чохральского. Установлено, что способ гомогенного легирования (шихта получается из прекурсора NbO :B и LiCO) по сравнению с твердофазным (шихта получается из смеси LiCO: NbO : HBO ) позволяет выращивать кристаллы LiNbO: B с более однородным распределением в них примеси бора, а также в объеме расплава, при этом упрощаются технологические режимы, устанавливаемые при росте кристаллов. В работе впервые рассмотрен жидкофазный метод синтеза шихты, исключающий стадию прокалки гомогенизированной смеси пентаоксида ниобия и карбоната лития. Результаты имеют важное значение при выборе технологии выращивания легированных бором монокристаллов ниобата лития для конкретных областей техники. Known methods of a boron doped lithium niobate charge synthesis were analyzed. Such a charge is applied for the growth by Czochralski of single crystals with high optical quality. Homogeneous doping (the charge is obtained from precursor NbO:B and LiCO) was compared with solid phase doping (the charge is obtained from the mixture LiCO: NbO: HBO). Homogeneous doping was determined to help produce LiNbO: B crystals with a more uniform distribution of a boron dopant, boron distributes more uniform in the melt volume; technological regimes established during crystal growth become easier. For the first time the paper considers liquid-phase charge synthesis method; the method excludes the stage of annealing of homogenized mixture of niobium pentoxide and lithium carbonate. Results are crucial for the choice of technology at growing of boron doped lithium niobate crystals for exact areas of technics.

Optical elements for near infrared spectra region from high optical quality lithium niobate single crystals

1994 ◽  
Author(s):  
Dmitry Y. Sugak ◽  
Andrej O. Matkovskii ◽  
E. A. Korobenko ◽  
Anatolij I. Mikhalevych ◽  
Ivan M. Solskii ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Single Crystals ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Optical Quality ◽  
Optical Elements ◽  
High Optical Quality ◽  
Near Infrared Spectra

Growth of high optical quality zinc chalcogenides single crystals by solid phase recrystallization technique at barothermal treatment

2017 ◽  
Vol 457 ◽  
pp. 275-281 ◽  
Author(s):  
Eugeni Gavrishuk ◽  
Vladimir Ikonnikov ◽  
Tatyana Kotereva ◽  
Vladimir Pimenov ◽  
Dmitry Savin ◽  
...  
Keyword(s):  
Single Crystals ◽  
Solid Phase ◽  
Optical Quality ◽  
High Optical Quality ◽  
Phase Recrystallization ◽  
Barothermal Treatment

scholarly journals Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 458
Author(s):  
Nikolay V. Sidorov ◽  
Natalia A. Teplyakova ◽  
Olga V. Makarova ◽  
Mikhail N. Palatnikov ◽  
Roman A. Titov ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Defect Structure ◽  
Photorefractive Effect ◽  
Ferroelectric Properties ◽  
High Concentration ◽  
Oh Groups ◽  
Boron Doped ◽  
Compositional Uniformity ◽  
Boron Dopant ◽  
Lithium Niobate Crystals

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.

Structural Features of Nominally Pure Lithium Niobate Crystals Grown from Boron-Doped Charge

2020 ◽  
Vol 312 ◽  
pp. 128-133
Author(s):  
Nikolay Sidorov ◽  
Roman Titov ◽  
Natalya A. Teplyakova ◽  
Mikhail Palatnikov ◽  
Alexander Vjacheslavovich Syuy
Keyword(s):  
Crystal Structure ◽  
Lithium Niobate ◽  
Single Crystals ◽  
Czochralski Method ◽  
Structural Features ◽  
Structural Defects ◽  
Cation Sublattice ◽  
Structural Units ◽  
Boron Doped ◽  
Lithium Niobate Crystals

The features of the structure of single crystals LiNbO3:B3+ (0.12 and 0.18 wt %) grown by the Czochralski method from the mixture of different genesis were studied. It was found that boron is able to incorporate into the crystal structure of lithium niobate in a trace amounts (~ 10–4–10–5 wt %), decreasing the concentration of structural defects NbLi. Thus, ordering of structural units of the cation sublattice of lithium niobate crystals grown from a congruent composition melt approach in that of stoichiometric crystals.

One-step synthesis at room temperature of low dimensional perovskite single crystals with high optical quality

2020 ◽  
Vol 221 ◽  
pp. 117079 ◽  
Author(s):  
Marco Cinquino ◽  
Laura Polimeno ◽  
Giovanni Lerario ◽  
Milena De Giorgi ◽  
Anna Moliterni ◽  
...  
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Optical Quality ◽  
High Optical Quality ◽  
One Step ◽  
Low Dimensional

Development of Gas-Solid Phase Hybrid Synthesis Method of Single Crystal Ba2SiO4:Eu2+

2011 ◽  
Vol 485 ◽  
pp. 325-328 ◽  
Author(s):  
Tatsuya Sakamoto ◽  
Kazuyoshi Uematsu ◽  
Tadashi Ishigaki ◽  
Kenji Toda ◽  
Mineo Sato
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystals ◽  
Solid Phase ◽  
Synthesis Method ◽  
Green Light ◽  
Single Crystal Growth ◽  
Novel Synthesis ◽  
Reductive Atmosphere ◽  
O Phase

We succeeded in the single crystal growth of Ba2SiO4:Eu2+ by novel synthesis method which was gas (SiO) and solid (Ba - Sc - Al - Eu - O) phase hybridized. The Ba2SiO4:Eu2+ single crystal was synthesized by interfacial crystal growth after the reaction of the SiO gas with the surface of Ba - Sc - Al - Eu - O substrate in the reductive atmosphere. The single crystals were plate-like crystals with about 500 μm sizes and emitted green light around 500 nm under 300 - 450 nm excitation.

Anisotropy of Optical and Electron Transport Properties of Atomic Ordering in CdGeAs2

1999 ◽  
Vol 607 ◽  
Author(s):  
B. H. Bairamov ◽  
N. Fernelius ◽  
G. Irmer ◽  
J. Monecke ◽  
I. K. Polushina ◽  
...  
Keyword(s):  
Light Scattering ◽  
Single Crystals ◽  
Wide Band ◽  
Optical Quality ◽  
Surface Barrier ◽  
Optical Phonons ◽  
High Optical Quality ◽  
Inelastic Light Scattering ◽  
Linearly Polarized ◽  
Electron Transport Properties

AbstractInelastic light scattering by optical phonons and the temperature dependent electrical conductivity, Hall constant and photosensitivity were studied in oriented CdGeAs2 crystals grown by ultra-low gradient freeze technique from near-stoichiometric melts. Observation of the clear polarization dependence of the inelastic light scattering spectra by optical phonons combined with the absence of any dependence of the intensity and frequency shift of the observed lines with mapping measurements in 300 μm steps indicated the high optical quality and homogeneity of these single crystals. It is shown that surface-barrier structures using these single crystals may be used as wide-band detectors for natural light, as well as selective photoanalyzers for linearly polarized radiation.

"Non-stoichiometry and point native defects in non-oxide non-linear optical large single crystals: advantages and problems"

CrystEngComm ◽  
2022 ◽  
Author(s):  
Inga Vasilyeva ◽  
Ruslan Nikolaev
Keyword(s):  
Single Crystals ◽  
Optical Quality ◽  
High Optical Quality ◽  
Native Defects ◽  
Non Linear ◽  
Linear Optical

Advances and limitations in the field of growing large, a high optical quality single crystals of AgGaS2 (AGS), AgGaGeS4 (AGGS), ZnGeP2 (ZGP), LiInS2 (LIS), LiGaS2 (LGS), LiInSe2 (LISe), LiGaSe2 (LGSe)...

UV-Visible Faraday Rotators Based on Rare-Earth Fluoride Single Crystals: LiREF4 (RE=Tb, Dy, Ho, Er and Yb), PrF3 and CeF3

2013 ◽  
Vol 582 ◽  
pp. 194-197
Author(s):  
Valentyn Vasyliev ◽  
Encarnacion G. Villora ◽  
Masaru Nakamura ◽  
Yoshiyuki Sugahara ◽  
Kiyoshi Shimamura
Keyword(s):  
Single Crystals ◽  
Figure Of Merit ◽  
Near Infrared ◽  
Vacuum Ultraviolet ◽  
Wavelength Region ◽  
Optical Quality ◽  
High Optical Quality ◽  
Figures Of Merit ◽  
Earth Fluoride ◽  
Uv Visible

High optical quality LiREF4(RE = Tb3+, Dy3+, Ho3+, Er3+and Yb3+), PrF3and CeF3single crystals have been grown by the Czochralski technique. Their magneto-optical properties have been measured and analyzed in detail in the ultraviolet-visible wavelength region, and their figures of merit as Faraday rotators have been determined. CeF3presents superior properties above 300 nm, showing a figure of merit higher than that of the reference material, terbium-gallium-garnet, which is nowadays used in the visible-near infrared. PrF3is the best rotator for the 220-300 nm range. Towards shorter wavelength and in the vacuum ultraviolet, it is shown that the LiREF4crystals are unique rotators.

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