Twinning structures in near-stoichiometric lithium niobate single crystals

2010 ◽  
Vol 43 (2) ◽  
pp. 276-279 ◽  
Author(s):  
Shuhua Yao ◽  
Xiaobo Hu ◽  
Tao Yan ◽  
Hong Liu ◽  
Jiyang Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Lithium Niobate ◽  
Single Crystals ◽  
Grown Crystal ◽  
Czochralski Method ◽  
Supply System ◽  
Twin Structure ◽  
X Ray ◽  
Double Crucible ◽  
Characteristic Growth

A near-stoichiometric lithium niobate single crystal has been grown by the Czochralski method in a hanging double crucible with a continuous powder supply system. Twins were found at one of the three characteristic growth ridges of the as-grown crystal. The twin structure was observed and analyzed by transmission synchrotron topography. The image shifts ΔXand ΔYin the transmission synchrotron topograph were calculated for the 3{\overline 2}{\overline 1}2 and 0\overline 222 reflections based on results from high-resolution X-ray diffractometry. It is confirmed that one of the {01{\overline 1}{\overline 2}}mplanes is the composition face of the twin and matrix crystals. The formation mechanism of these twins is discussed.

Growth, defects, and properties of GdCa4O(BO3)3and Nd:GdCa4O(BO3)3crystals

2001 ◽  
Vol 16 (3) ◽  
pp. 790-796 ◽  
Author(s):  
Jiyang Wang ◽  
Xiaobo Hu ◽  
Xin Yin ◽  
Renbo Song ◽  
Jingqian Wei ◽  
...  
Keyword(s):  
High Resolution ◽  
Elastic Constants ◽  
Figure Of Merit ◽  
Czochralski Method ◽  
Twin Structure ◽  
High Quality ◽  
X Ray ◽  
Growth Defects

Pure and neodymium-doped gadolinium calcium oxoborate crystals of high quality were grown by the Czochralski method. The orientation of crystal was precisely determined, and the samples for measurements were prepared. Through synchrotron x-ray topography and high-resolution x-ray diffractometry, the twin structure was discovered. Some properties such as the figure of merit value, and dielectric, piezoelectric, and elastic constants were measured along with a discussion of the anisotropy of the laser properties.

scholarly journals Discontinuities at the melting point of bismuth

1931 ◽  
Vol 133 (821) ◽  
pp. 162-172 ◽  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Random Distribution ◽  
Grown Crystal ◽  
Perfect Crystal ◽  
Real Property ◽  
Resistance Change ◽  
X Ray ◽  
Almost All ◽  
Brittle Crystals

During the last two or three years considerable attention has been given to the growth of single crystals of bismuth and to their physical properties. The result of this work has shown that the preparation of a good single crystal is exceedingly difficult, the process being easily disturbed in many ways, and the conclusion must be drawn that it has not yet been possible to obtain anything approaching a perfect crystal. In all cases where the grown crystal has been adequately examined, it has been necessary to admit that the supposed single crystal was full of discontinuities. This was shown by Kapitza* in his work on the growth and magneto­-resistance change of single crystals of bismuth. He found it very difficult to produce a crystal rod parallel to the hexagonal axis that was flexible. Almost all the crystals grown with this orientation were apparently brittle in that a very little strain would cause a sharp fracture parallel to the principal cleavage plane. Some crystals indeed broke up into small pieces 2 or 3 mm. long when dropped from a height of a few centimetres on a table. As the separate pieces proved to be fairly flexible this brittleness is not a real property of the crystal, but appears to be due to isolated cracks or discontinuities in the crystal (the word “crack” is used with the meaning defined by Kapitza in his paper, where further arguments for their existence from X-ray and resistance measurements are given). These cracks are not characteristic only of the brittle crystals, but appear to be present in many flexible crystals as well, their flexibility being due to a random distribution of a comparatively large number of cracks small in area compared to the dimensions of the rod.

High Resolution X-Ray Characterization of Sub-Micron Periodic Domain Structures in Lithium Niobate Crystals

2007 ◽  
Vol 352 (1) ◽  
pp. 25-34 ◽  
Author(s):  
M. Bazzan ◽  
N. Argiolas ◽  
C. Sada ◽  
P. Mazzoldi ◽  
S. Grilli ◽  
...  
Keyword(s):  
High Resolution ◽  
Lithium Niobate ◽  
Periodic Domain ◽  
X Ray ◽  
Domain Structures ◽  
Lithium Niobate Crystals

X-ray topo-tomography studies of linear dislocations in silicon single crystals

2018 ◽  
Vol 51 (6) ◽  
pp. 1616-1622 ◽  
Author(s):  
Victor Asadchikov ◽  
Alexey Buzmakov ◽  
Felix Chukhovskii ◽  
Irina Dyachkova ◽  
Denis Zolotov ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
High Resolution ◽  
Single Crystals ◽  
Complete Characterization ◽  
Reconstruction Technique ◽  
Algebraic Reconstruction Technique ◽  
X Ray ◽  
Laboratory Setup ◽  
Simultaneous Algebraic Reconstruction Technique

This article describes complete characterization of the polygonal dislocation half-loops (PDHLs) introduced by scratching and subsequent bending of an Si(111) crystal. The study is based on the X-ray topo-tomography technique using both a conventional laboratory setup and the high-resolution X-ray image-detecting systems at the synchrotron facilities at KIT (Germany) and ESRF (France). Numerical analysis of PDHL images is performed using the Takagi–Taupin equations and the simultaneous algebraic reconstruction technique (SART) tomographic algorithm.

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.

Basal plane bending of 4H-SiC single crystals grown by sublimation method with different seed attachment methods

CrystEngComm ◽  
2018 ◽  
Vol 20 (43) ◽  
pp. 6957-6962 ◽  
Author(s):  
Xianglong Yang ◽  
Jinying Yu ◽  
Xiufang Chen ◽  
Yan Peng ◽  
Xiaobo Hu ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Basal Plane ◽  
X Ray ◽  
Sublimation Method ◽  
Plane Bending

Basal plane bending of 4H-SiC single crystals grown using the sublimation method on an open or closed backside seed was measured using high-resolution X-ray diffractometry.

High-resolution x-ray microstructural study of single crystals of YBa_{2}Cu_{3}O_{7-δ}

1988 ◽  
Vol 37 (4) ◽  
pp. 2301-2304 ◽  
Author(s):  
Hoydoo You ◽  
J. Axe ◽  
X. Kan ◽  
S. Moss ◽  
J. Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Microstructural Study ◽  
X Ray
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