Electrical Field Effects on Crystalline Perfection of MBA-NP Crystals by Mapping of Bragg-Surface Diffraction

1999 ◽  
Vol 561 ◽  
Author(s):  
S.L. Morelhão ◽  
L.H. Avanci ◽  
M.A. Hayashi ◽  
L.P. Cardoso
Keyword(s):  
Crystal Surface ◽  
Crystalline Perfection ◽  
Electrical Field ◽  
Molecular Dipole ◽  
Field Effects ◽  
Primary Extinction ◽  
Surface Diffraction ◽  
Diffraction Condition

ABSTRACTThe interaction of weak electrical field with the molecular dipole of the MBA-NP crystals is investigated. Such interaction affects the misorientation and size of the perfect diffracting regions of the crystal, which is monitored by mapping the Bragg-surface diffraction condition. This diffraction technique has also confirmed that the diffracting regions are large enough to allow primary extinction and the non-uniform mosaicity along the crystal surface.

Investigation on Large-Sized Sapphire Crystalline Perfection by X-Ray Double-Crystal Diffraction Method

2007 ◽  
Vol 353-358 ◽  
pp. 1521-1524 ◽  
Author(s):  
Gui Gen Wang ◽  
Ming Fu Zhang ◽  
Hong Bo Zuo ◽  
Xiao Dong He ◽  
Jie Cai Han ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Crystal Surface ◽  
Diffraction Method ◽  
Sapphire Crystal ◽  
Crystalline Perfection ◽  
Double Crystal ◽  
X Ray ◽  
Infrared Spectral ◽  
Growth Method ◽  
Small Temperature Gradient

The large-sized sapphire (Ø225×205 mm, 27.5 kg) was grown successfully by SAPMAC method (sapphire growth technique with micro-pulling and shoulder-expanding at cooled center). The surface quality of the specimens was characterized by micro-Raman spectroscopy, and double crystal X-ray diffractometry (DCD) was utilized to investigate its crystalline perfection. The measurement of rocking curves was performed on various specimens from different region of large sapphire boule. The experimental results showed that CMP (chemo-mechanical polishing) with subsequent suitable chemically etching can develop the best-quality sapphire crystal surface and the values of FWHM obtained by conventional DCD were in the range from 27” to 58”. The infrared spectral transmission (2.0-4.5 5m) of sapphire crystal exceeded 82%. It is confirmed of SAPMAC growth method characteristics with in-situ annealing, small temperature gradient and low residual stress level by numerical simulation analysis.

Electrical field effects induced in membranes of developing chloroplasts

Planta ◽  
1980 ◽  
Vol 147 (5) ◽  
pp. 396-404 ◽  
Author(s):  
G. Pilwat ◽  
R. Hampp ◽  
U. Zimmermann
Keyword(s):  
Electrical Field ◽  
Field Effects

Electronic structures and transverse electrical field effects in folded zigzag-edged graphene nanoribbons

2010 ◽  
Vol 97 (15) ◽  
pp. 153129 ◽  
Author(s):  
X. H. Zheng ◽  
L. L. Song ◽  
R. N. Wang ◽  
H. Hao ◽  
L. J. Guo ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Graphene Nanoribbons ◽  
Electrical Field ◽  
Field Effects

Electrical field effects on crushed nerve regeneration

1992 ◽  
Vol 117 (1) ◽  
pp. 71-80 ◽  
Author(s):  
James M. Kerns ◽  
Claudia Lucchinetti
Keyword(s):  
Nerve Regeneration ◽  
Electrical Field ◽  
Field Effects ◽  
Crushed Nerve
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