The Origin of Nonlinear Optical Activity of 1,3,5-Triamino-2,4,6-trinitrobenzene in the Solid State:  The Crystal Structure of a Non-Centrosymmetric Polymorph as Determined by Electron Diffraction

1996 ◽  
Vol 118 (50) ◽  
pp. 12830-12831 ◽  
Author(s):  
Ingrid G. Voigt-Martin ◽  
Gao Li ◽  
A. Yakimanski ◽  
Gabriela Schulz ◽  
J. Jens Wolff
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Electron Diffraction ◽  
Optical Activity ◽  
Nonlinear Optical

Improved synthesis and crystal structure of the parent 1,3,5-trisilacyclohexane

2016 ◽  
Vol 71 (1) ◽  
pp. 77-79 ◽  
Author(s):  
Eugen Weisheim ◽  
Hans-Georg Stammler ◽  
Norbert W. Mitzel
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Electron Diffraction ◽  
Gas Phase ◽  
Gaseous Phase ◽  
Chair Conformation ◽  
Gas Electron Diffraction ◽  
State Structure ◽  
Synthesis And Crystal Structure ◽  
Bond Lengths

AbstractThe crystal structure and an improved synthesis of 1,3,5-trisilacyclohexane are reported. The solid state structure is compared with the reported structure determined in the gas phase by gas electron diffraction (GED). 1,3,5-Trisilacyclohexane adopts a chair conformation in the solid state. The Si–C bond lengths as well as all angles of 1,3,5-trisilacyclohexane in the solid state have similar dimensions compared to the structure in the gaseous phase.

Crystal structure, molecular packing, FMO, NBO, nonlinear optical and optical limiting properties of an organic imidazolium diphenylacetate diphenylacetic acid single crystal

2018 ◽  
Vol 42 (4) ◽  
pp. 2439-2449 ◽  
Author(s):  
RO. MU. Jauhar ◽  
Paavai Era ◽  
V. Viswanathan ◽  
P. Vivek ◽  
G. Vinitha ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Optical Activity ◽  
Structural Characterization ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Molecular Packing ◽  
Optical Material ◽  
Nonlinear Optical Material ◽  
Diphenylacetic Acid

A new organic nonlinear optical material, imidazolium diphenylacetate diphenylacetic acid, with excellent structural characterization and nonlinear optical activity has been reported.

scholarly journals Discovery of natural MgSiO3tetragonal garnet in a shocked chondritic meteorite

2016 ◽  
Vol 2 (3) ◽  
pp. e1501725 ◽  
Author(s):  
Naotaka Tomioka ◽  
Masaaki Miyahara ◽  
Motoo Ito
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Solid State ◽  
Electron Diffraction ◽  
Cooling Rate ◽  
Upper Bound ◽  
Cation Ordering ◽  
State Transformation ◽  
Solid State Transformation ◽  
Shock Temperature

MgSiO3tetragonal garnet, which is the last of the missing phases of experimentally predicted high-pressure polymorphs of pyroxene, has been discovered in a shocked meteorite. The garnet is formed from low-Ca pyroxene in the host rock through a solid-state transformation at 17 to 20 GPa and 1900° to 2000°C. On the basis of the degree of cation ordering in its crystal structure, which can be deduced from electron diffraction intensities, the cooling rate of the shock-induced melt veins from ~2000°C was estimated to be higher than 103°C/s. This cooling rate sets the upper bound for the shock-temperature increase in the bulk meteorite at ~900°C.

Crystal structure of new phosphates Ca9–xPbxEu(PO4)7 from Rietveld refinement

2015 ◽  
Vol 30 (S1) ◽  
pp. S101-S103 ◽  
Author(s):  
Dina Deyneko ◽  
Sergey Stefanovich ◽  
Bogdan Lazoryak
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Rietveld Method ◽  
Polar Space ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Air Atmosphere

New phosphates Ca9–xPbxEu(PO4)7 were obtained by solid state reaction techniques at 1213–1253 K in air atmosphere and were found to be isotypic with whitlockite-type β-Ca3(PO4)2. The unit cell parameters were determinate using Le Bail decomposition. Rietveld method structural refining showed that Eu3+ ions are located statistically with calcium in M1, M2, and M3 sites, whereas Pb2+-ions are preferentially located in the M3. Examination of optical second harmonic generation evidences nonlinear optical activity and confirms polar space group R3c.

A new organic NLO material isonicotinamidium picrate (ISPA): crystal structure, structural modeling and its physico-chemical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 57977-57985 ◽  
Author(s):  
RO. MU. Jauhar ◽  
V. Viswanathan ◽  
P. Vivek ◽  
G. Vinitha ◽  
D. Velmurugan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Optical Activity ◽  
Nonlinear Optical ◽  
Chemical Properties ◽  
Structural Modeling ◽  
Optical Material ◽  
Nonlinear Optical Material ◽  
Physico Chemical

A new organic nonlinear optical material isonicotinamidium picrate, with excellent nonlinear optical activity and thermal stability has been reported.

An electron-diffraction study of the transformation α -Fe 2 O 3 to γ -Fe 2 O 3

1957 ◽  
Vol 241 (1224) ◽  
pp. 1-8 ◽  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Electron Diffraction ◽  
Diffraction Study ◽  
Single Crystals ◽  
Electron Diffraction Study ◽  
Magnetic Behaviour ◽  
Unit Cell ◽  
Prolonged Heating ◽  
Oxygen Ion

Outgrowths formed on haematite single crystals by heating in air have been examined by electron diffraction. At 500°C a change occurs in their crystal structure, apparently due to the migration of some cations to tetrahedral interstices. Otherwise, the unit cell and oxygen-ion framework of this 'β -phase’ remain as in α -Fe 2 O 3 (haematite). At 700°C the structure of the outgrowths changes to one characteristic of γ -Fe 2 O 3 and persists as such, even after prolonged heating at 900°C. Thus the transformation γ -Fe 2 O 3 to α -Fe 2 O 3 is not, as has been supposed, strictly irreversible, since the α-γ transition has now been found to occur under suitable conditions. The presence of β -phase traces seems to be the cause of the anomalous magnetic behaviour of haematite observed by Néel and others. It is concluded that the α-γ transformation is a necessary step preceding the solid-state spinelization reaction involved in the formation of a ferrospinel.

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