A Broadband marine CSEM demonstration survey to map the Uranus salt structure

2010 ◽  
Author(s):  
M. Vöge ◽  
A. A. Pfaffhuber ◽  
K. Hokstad ◽  
B. Fotland
Keyword(s):  
Salt Structure ◽  
Marine Csem

On the Faceting of Polar Ceramic Surfaces: Microscopy and Holography Studies of MGO(111) Surfaces

1996 ◽  
Vol 54 ◽  
pp. 366-367
Author(s):  
M. Gajdardziska-Josifovska ◽  
B. G. Frost ◽  
E. Völkl ◽  
L. F. Allard
Keyword(s):  
Electron Microscopy ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Electron Holography ◽  
Flat Surfaces ◽  
Transmission Electron ◽  
Excess Surface ◽  
Polar Surfaces ◽  
Salt Structure ◽  
Crystallographic Planes

Polar surfaces are those crystallographic faces of ionically bonded solids which, when bulk terminated, have excess surface charge and a non-zero dipole moment perpendicular to the surface. In the case of crystals with a rock salt structure, {111} faces are the exemplary polar surfaces. It is commonly believed that such polar surfaces facet into neutral crystallographic planes to minimize their surface energy. This assumption is based on the seminal work of Henrich which has shown faceting of the MgO(111) surface into {100} planes giving rise to three sided pyramids that have been observed by scanning electron microscopy. These surfaces had been prepared by mechanical polishing and phosphoric acid etching, followed by Ar+ sputtering and 1400 K annealing in ultra-high vacuum (UHV). More recent reflection electron microscopy studies of MgO(111) surfaces, annealed in the presence of oxygen at higher temperatures, have revealed relatively flat surfaces stabilized by an oxygen rich reconstruction. In this work we employ a combination of optical microscopy, transmission electron microscopy, and electron holography to further study the issue of surface faceting.

Twin Boundary in Bechgaard Salt: Structure and Unusual Dynamics

1996 ◽  
Vol 6 (12) ◽  
pp. 1567-1574 ◽  
Author(s):  
M. Mukoujima ◽  
K. Kawabata ◽  
T. Sambongi
Keyword(s):  
Twin Boundary ◽  
Salt Structure ◽  
Bechgaard Salt

Li0.625Al0.125H0.25Cl0.75O0.25 Superionic Conductor with Disordered Rock-Salt Structure

2021 ◽  
Author(s):  
Qian Zhang ◽  
William Arnold ◽  
Zachary D. Hood ◽  
Yang Li ◽  
Rachel DeWees ◽  
...  
Keyword(s):  
Rock Salt ◽  
Superionic Conductor ◽  
Rock Salt Structure ◽  
Salt Structure

scholarly journals The Band-Gap Studies of Short-Period CdO/MgO Superlattices

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ewa Przeździecka ◽  
P. Strąk ◽  
A. Wierzbicka ◽  
A. Adhikari ◽  
A. Lysak ◽  
...  
Keyword(s):  
Band Gap ◽  
Layer Thickness ◽  
Energy Gap ◽  
Band Gaps ◽  
Short Period ◽  
Wide Range ◽  
Salt Structure ◽  
Short Period Superlattices ◽  
Direct Band ◽  
Sublayer Thickness

AbstractTrends in the behavior of band gaps in short-period superlattices (SLs) composed of CdO and MgO layers were analyzed experimentally and theoretically for several thicknesses of CdO sublayers. The optical properties of the SLs were investigated by means of transmittance measurements at room temperature in the wavelength range 200–700 nm. The direct band gap of {CdO/MgO} SLs were tuned from 2.6 to 6 eV by varying the thickness of CdO from 1 to 12 monolayers while maintaining the same MgO layer thickness of 4 monolayers. Obtained values of direct and indirect band gaps are higher than those theoretically calculated by an ab initio method, but follow the same trend. X-ray measurements confirmed the presence of a rock salt structure in the SLs. Two oriented structures (111 and 100) grown on c- and r-oriented sapphire substrates were obtained. The measured lattice parameters increase with CdO layer thickness, and the experimental data are in agreement with the calculated results. This new kind of SL structure may be suitable for use in visible, UV and deep UV optoelectronics, especially because the energy gap can be precisely controlled over a wide range by modulating the sublayer thickness in the superlattices.

SYNTHESIS OF L-α-CEPHALINS CONTAINING FATTY ACIDS OF SHORTER CHAIN LENGTH: WATER-SOLUBLE GLYCEROLPHOSPHATIDES II

1960 ◽  
Vol 38 (1) ◽  
pp. 859-864
Author(s):  
Erich Baer ◽  
Tibor Gróf
Keyword(s):  
Fatty Acids ◽  
Chain Length ◽  
Chloroform Solution ◽  
Water Soluble ◽  
Simultaneous Removal ◽  
Protective Groups ◽  
Salt Structure ◽  
Catalytic Hydrogenolysis

L-α-(Dihexanoyl)cephalin has been synthesized by the phosphorylation of D-α,β-dihexanoylglycerol with phenylphosphoryl dichloride and pyridine, esterification of the reaction product, viz. dihexanoyl-L-α-glycerylphenylphosphoryl chloride, with N-carbobenzoxyethanolamine, and simultaneous removal of the protective groups of dihexanoyl-L-α-glycerylphenylphosphoryl-N-carbobenzoxyethanolamine by catalytic hydrogenolysis. The L-α-(dihexanoyl)cephalin is soluble in water.Infrared evidence supports the inner-salt structure of cephalins in chloroform solution.

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