Crystal structure of lithium niobium ethoxide (LiNb(OCH2CH3)6: a precursor for lithium niobate ceramics

1990 ◽  
Vol 29 (8) ◽  
pp. 1458-1459 ◽  
Author(s):  
Dennis J. Eichorst ◽  
Kevin E. Howard ◽  
David A. Payne ◽  
Scott R. Wilson
Keyword(s):  
Crystal Structure ◽  
Lithium Niobate ◽  
Niobium Ethoxide

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.

Growth Ridges, Etched Hillocks, and Crystal Structure of Lithium Niobate

1967 ◽  
Vol 6 (3) ◽  
pp. 318-327 ◽  
Author(s):  
Nobukazu Niizeki ◽  
Tomoaki Yamada ◽  
Hiroo Toyoda
Keyword(s):  
Crystal Structure ◽  
Lithium Niobate

Evolution Of Molecular Structure In Alkoxide-Derived Lithium Niobate

1990 ◽  
Vol 180 ◽  
Author(s):  
Dennis J. Eichorst ◽  
D. A. Payne
Keyword(s):  
Heat Treatment ◽  
Lithium Niobate ◽  
Structural Changes ◽  
Sol Gel ◽  
Lithium Oxide ◽  
Structural Rearrangements ◽  
Raman Spectroscopic ◽  
Amorphous Network ◽  
Niobium Ethoxide ◽  
Gel Processing

ABSTRACTStructural rearrangements during the sol-gel processing of lithium niobate were investigated by FTlR and Raman spectroscopic methods. The reaction of lithium ethoxide with niobium ethoxide resulted in the formation of a bimetallic alkoxide, LiNb(OEt)6 , which could be crystallized from solution. Single crystals were comprised of helical polymeric units consisting of niobium octahedra linked by lithium in tetrahedral (distorted) coordination. Successive crystallizations from solution allowed for the enhanced purification of the alkoxide precursor. Hydrolysis of the bimetallic alkoxide resulted in the formation of an amorphous network structure, which contained niobium-oxygen octahedral units modified by lithium. Heat-treatment facilitated structural rearrangements for the niobium environment, which allowed for the formation of the lithium niobate crystal structure. Further heat-treatment above 700°C resulted in structural changes associated with lithium oxide volatility.

Erbium doping into lithium niobate and sapphire single crystal wafers

2001 ◽  
Vol 16 (2) ◽  
pp. 333-335 ◽  
Author(s):  
P. Nekvindova ◽  
J. Spirkova-Hradilova ◽  
J. Schröfel ◽  
V. Perina
Keyword(s):  
Crystal Structure ◽  
Lithium Niobate ◽  
Single Crystal ◽  
Crystallographic Orientation ◽  
Moderate Temperature ◽  
Strong Anisotropy ◽  
Erbium Doping ◽  
Crucial Point ◽  
Sapphire Single Crystal ◽  
First Time

The possibility of localized doping by Er3+ diffusion at moderate (less than 500 °C) temperature was for the first time demonstrated for sapphire single crystal wafers. The doping was achieved by immersing the substrate wafers into reaction melt containing small amounts of erbium salt. The crucial point of the presented technology was a crystallographic orientation of the used wafers. The most suitable orientation of the cuts was the “X-cut” with orientation (11–20). The strong anisotropy of the moderate temperature Er3+ doping into lithium niobate and sapphire was explained on the basis of the crystal structure of particular cuts.

scholarly journals Lithium Niobate Single Crystals and Powders Reviewed—Part I

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 973
Author(s):  
Oswaldo Sánchez-Dena ◽  
Cesar David Fierro-Ruiz ◽  
Sergio David Villalobos-Mendoza ◽  
Diana María Carrillo Flores ◽  
José Trinidad Elizalde-Galindo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Lithium Niobate ◽  
Single Crystals ◽  
Accurate Determination ◽  
Indirect Methods ◽  
Methods Of Synthesis ◽  
Potential Applications ◽  
Historical Remarks

A review of lithium niobate single crystals and polycrystals in the form of powders has been prepared. Both the classical and recent literature on this topic are revisited. It is composed of two parts with sections. The current part discusses the earliest developments in this field. It treats in detail the basic concepts, the crystal structure, some of the established indirect methods to determine the chemical composition, and the main mechanisms that lead to the manifestation of ferroelectricity. Emphasis has been put on the powdered version of this material: methods of synthesis, the accurate determination of its chemical composition, and its role in new and potential applications are discussed. Historical remarks can be found scattered throughout this contribution. Particularly, an old conception of the crystal structure thought as a derivative structure from one of higher symmetry by generalized distortion is here revived.

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