Lithium Diffusion in Lithium Niobate Crystals with Different Initial Li2 O Content at High Temperature

2016 ◽  
Vol 99 (9) ◽  
pp. 3055-3059
Author(s):  
Qinglian Li ◽  
Jun Sun ◽  
Jinfeng Yang ◽  
Jifang Shang ◽  
Ling Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Lithium Diffusion ◽  
Lithium Niobate Crystals

Coloring Changes of Congruent LiNbO3 Crystals under Redox Annealing

2015 ◽  
Vol 230 ◽  
pp. 228-232 ◽  
Author(s):  
Dmytro Yu. Sugak
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Structural Properties ◽  
High Temperature Annealing ◽  
Lithium Niobate Crystals ◽  
Congruent Lithium Niobate

The paper is to discuss the main characteristics of the influence of high temperature annealing in different gas environments on the optical and structural properties of congruent lithium niobate crystals.

scholarly journals High-temperature poling treatment of congruent ferroelectric LiNb0.5Ta0.5O3 solid solution single crystals

2021 ◽  
Vol 7 (1) ◽  
pp. 17-20
Author(s):  
Anatolii A. Mololkin ◽  
Dmitry V. Roshchupkin ◽  
Eugenii V. Emelin ◽  
Rashid R. Fahrtdinov
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Lithium Niobate ◽  
Curie Temperature ◽  
Physical Properties ◽  
Single Crystals ◽  
Thermal Instability ◽  
Poling Process ◽  
Lithium Niobate Crystals ◽  
Piezoelectric Constants

Lithium niobate and tantalate are among the most important and widely used materials of acoustooptics and acoustoelectronics. They have high piezoelectric constants enabling their use as actuators. Their use is however restricted by the thermal instability of lithium niobate crystals and the low Curie temperature TC of lithium tantalate crystals. Overcoming these drawbacks typical of some compounds is possible by growing LiNb1-xTaxO3 single crystals. Good quality LiNb1-xTaxO3 single crystals have been grown using the Czochralsky technique. High-temperature poling process of LiNb1-xTaxO3 single crystals has been studied. The main differences between the process modes required for poling of congruent LiNb1-xTaxO3 single crystals and congruent LiNbO3 single crystals have been demonstrated. Parameters of high-temperature electric diffusion processing of LiNb1-xTaxO3 single crystals that provide for singledomain crystals for further study of physical properties have been reported.

High Temperature Dielectric, Elastic and Piezoelectric Coefficients of Shear Type Lithium Niobate Crystals

2013 ◽  
Vol 543 ◽  
pp. 117-120 ◽  
Author(s):  
Abbas Mohimi ◽  
Philip Richardson ◽  
Phil Catton ◽  
Tat Hean Gan ◽  
Wamadeva Balachandran ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Power Plants ◽  
Guided Wave ◽  
Capacitance Density ◽  
Impedance Measurements ◽  
Shear Type ◽  
Design And Manufacture ◽  
Lithium Niobate Crystals

In this paper shear type lithium niobate has been studied. The impedance-frequency characteristics were measured at high temperatures. This was carried out by placing the samples inside a furnace and performing in-situ impedance measurements at up to 600°C. The characteristic frequencies, capacitance, density and dimensions of samples were used to calculate the dielectric, elastic and piezoelectric coefficients. Prototype transducers were built using shear type lithium niobate crystals. The initial ultrasonic experiments show that it can be used at temperatures up to 450°C to transmit and receive guided wave signals at 70 kHz. This will enable design and manufacture of high temperature transducers for continuous guided wave monitoring of power plants.

Formation Dynamics of Transmission Holograms in Lithium Niobate Crystals Doped by Copper Through High-Temperature Diffusion

2015 ◽  
Vol 57 (8-9) ◽  
pp. 603-609 ◽  
Author(s):  
K. M. Mambetova ◽  
N. N. Smal’ ◽  
S. M. Shandarov ◽  
L.N. Orlikov ◽  
S. I. Arestov ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Temperature Diffusion ◽  
Formation Dynamics ◽  
Lithium Niobate Crystals

Growth and Characterization of High Homogeneity Heavily MgO-doped Lithium Niobate Crystals

2011 ◽  
Vol 25 (12) ◽  
pp. 1257-1262 ◽  
Author(s):  
Xiao-Niu TU ◽  
Yan-Qing ZHENG ◽  
Hui CHEN ◽  
Hai-Kuan KONG ◽  
Jun XIN ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Homogeneity ◽  
Lithium Niobate Crystals

Formation of Regular Domain Structures in Quenched Ferroelectrics Under the Influence of an External High-frequency Electric Field

2019 ◽  
Vol 9 (3) ◽  
pp. 344-352 ◽  
Author(s):  
L.I. Stefanovich ◽  
O.Y. Mazur ◽  
V.V. Sobolev
Keyword(s):  
Lithium Niobate ◽  
Electric Field ◽  
Domain Structure ◽  
High Frequency ◽  
Evolution Equations ◽  
Regular Domain ◽  
Field Frequency ◽  
Domain Structures ◽  
Alternating Electric Field ◽  
Lithium Niobate Crystals

Introduction: Within the framework of the phenomenological theory of phase transitions of the second kind of Ginzburg-Landau, the kinetics of ordering of a rapidly quenched highly nonequilibrium domain structure is considered using the lithium tantalate and lithium niobate crystals as an example. Experimental: Using the statistical approach, evolution equations describing the formation of the domain structure under the influence of a high-frequency alternating electric field in the form of a standing wave were obtained. Numerical analysis has shown the possibility of forming thermodynamically stable mono- and polydomain structures. It turned out that the process of relaxation of the system to the state of thermodynamic equilibrium can proceed directly or with the formation of intermediate quasi-stationary polydomain asymmetric phases. Results: It is shown that the formation of Regular Domain Structures (RDS) is of a threshold character and occurs under the influence of an alternating electric field with an amplitude less than the critical value, whose value depends on the field frequency. The conditions for the formation of RDSs with a micrometer spatial scale were determined. Conclusion: As shown by numerical studies, the RDSs obtained retain their stability, i.e. do not disappear even after turning off the external electric field. Qualitative analysis using lithium niobate crystals as an example has shown the possibility of RDSs formation in high-frequency fields with small amplitude under resonance conditions

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.

Microindentation of proton exchange layers on X cut of lithium niobate crystals

2012 ◽  
Vol 135 (2-3) ◽  
pp. 493-496 ◽  
Author(s):  
I.V. Petukhov ◽  
V.I. Kichigin ◽  
A.P. Skachkov ◽  
S.S. Mushinsky ◽  
D.I. Shevtsov ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Proton Exchange ◽  
Lithium Niobate Crystals
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