scholarly journals The influence of high pressure on the properties of natural alumino-silicates

2002 ◽  
Vol 34 (2) ◽  
pp. 163-168
Author(s):  
N. Susic
Keyword(s):  
High Pressure ◽  
Thermal Behaviour ◽  
Amorphous Layer ◽  
New Materials ◽  
Crystalline Phases ◽  
Amorphous Phases ◽  
Long Period ◽  
Two Samples ◽  
Mineral Compositions

The effect of the application of high-pressure (up to 12 GPa) on natural alumino-silicates has been studied. Chemical and mineral compositions and thermal behaviour have been analyzed of two samples of alumino-silicates. Results obtained indicate that the application of high pressure causes notable changes. A particularly significant one is the formation of amorphous phases on account of crystalline phases. An amorphous layer formed on particle surfaces with its diverse physical, mechanical, chemical, and other properties, especially over a long period of time, can influence the processes provoking or activating land slides or soil settlements. This enables derivation of many new materials with entirely new properties important for use in the ceramic and brick industries.

Infrared study on crystalline and amorphous phases of 2-propyn-1-ol under high pressure

2005 ◽  
Vol 369 (1-4) ◽  
pp. 44-50 ◽  
Author(s):  
Hiroshi Yamawaki ◽  
Mami Sakashita ◽  
Hiroshi Fujihisa ◽  
Kazumasa Honda
Keyword(s):  
High Pressure ◽  
Infrared Study ◽  
Amorphous Phases

Determination of Uncombined Intermediates in FD&C Yellow No. 6 by High-Pressure Liquid Chromatography

1974 ◽  
Vol 57 (2) ◽  
pp. 358-359
Author(s):  
Manjeet Singh
Keyword(s):  
High Pressure ◽  
Chromatographic Method ◽  
Sulfanilic Acid ◽  
Sunset Yellow ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Method ◽  
Two Samples ◽  
Liquid Chromatographic ◽  
Good Agreement

Abstract A high-pressure liquid chromatographic method is presented for the isolation and determination of uncombined intermediates in FD&C Yellow No. 6 (sunset yellow FCF, CI. No. 15895). Samples of FD&C Yellow No. 6 containing 0.1-0.4% sulfanilic acid, 0.1-0.4% 6-hydroxy-2-naphthalenesulfonic acid, and 0.3— 1.0% 6,6'-oxybis(2-naphthalenesulfonic acid) were prepared and analyzed using this method. Recoveries ranged between 94 and 101%. Twenty-two samples of FD&C Yellow No. 6 were analyzed by the conventional column elution chromatographic method as well as by the high-pressure liquid chromatographic method. Good agreement was obtained between the 2 methods.

Mechanism of Stress-Enhanced Solid-Phase Epitaxy

1991 ◽  
Vol 237 ◽  
Author(s):  
T. K. Chaki
Keyword(s):  
Hydrostatic Pressure ◽  
Point Defects ◽  
Solid Phase ◽  
Amorphous Solid ◽  
Amorphous Layer ◽  
Crystalline Phases ◽  
Self Diffusion ◽  
Bending Stresses ◽  
Enhanced Mobility ◽  
The Difference

ABSTRACTEnhancement of solid-phase epitaxial growth (SPEG) due to hydrostatic pressures and bending stresses is explained by stress-enhanced mobility of point defects in the amorphous solid. The crystallization is by the adjustment of atomic positions in the vicinity of the crystallization/amorphous (c-a) interface due to self-diffusion in the amorphous phase, assisted by a free energy decrease equal to the difference in free energies between the amorphous and crystalline phases. Due to a mismatch in the bulk moduli between the amorphous and crystalline phases, the application of a hydrostatic pressure can develop tensile stresses in the amorphous layer near the c-a interface. Non-hydrostatic stresses in the amorphous layer enhance the mobility of point defects in the amorphous layer and, therefore, an enhancement of the SPEG rate. In the cases of both hydrostatic pressure and bending, the enhancement occurs in the tensile side, indicating that vacancy-like mechanism is predominant in SPEG.

Controlling the thermoelectric power of silicon–germanium alloys in different crystalline phases by applying high pressure

CrystEngComm ◽  
2020 ◽  
Vol 22 (33) ◽  
pp. 5416-5435
Author(s):  
Natalia V. Morozova ◽  
Igor V. Korobeinikov ◽  
Nikolay V. Abrosimov ◽  
Sergey V. Ovsyannikov
Keyword(s):  
High Pressure ◽  
Thermoelectric Power ◽  
Silicon Germanium ◽  
Next Generation ◽  
Crystalline Phases ◽  
Nanoelectronic Devices ◽  
Electronic Junctions ◽  
Silicon Germanium Alloys

Si–Ge crystals are promising materials for use in various stress-controlled electronic junctions for next-generation nanoelectronic devices.

Phase Stability and Elastic Properties of оne Dimensional Long Period Structures of Al3Ti under High Pressure

2016 ◽  
Vol 850 ◽  
pp. 354-361
Author(s):  
Ping Ying Tang ◽  
Guo Hua Huang ◽  
Qing Lian Xie ◽  
Jin Li Huang
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Elastic Properties ◽  
Phase Stability ◽  
Antiphase Boundary ◽  
First Principles Calculations ◽  
One Dimensional ◽  
Long Period ◽  
Phase Transition Pressure ◽  
Order Polynomial

Phase stability and elastic properties of seven one dimensional long period structures (1D-LPSs) of Al3Ti under high pressure have been systematically investigated by first-principles calculations. The enthalpy differences indicate that Al3Ti will undergo a phase transition from 1D-LPSs to L12 structure at high pressure. With increase of antiphase boundary period parameter M’, the enthalpy initially decreases and then increases, and the enthalpy for D023 is the smallest. Oppositely, the phase transition pressure firstly increases and then decreases, and the maximum is for D023. The elastic constants and elastic moduli B, G and E increase monotonically with increase of pressure, and the corresponding second-order polynomial fits are also obtained. Interestingly, the pressure dependence of Poisson’s ratio show similar tendency with that of B/G ratio. Both the B/G ratios and the Cauchy pressures reveal that these 1D-LPSs exhibit brittleness at high pressure.

scholarly journals Ionic liquid, glass or crystalline solid? Structures and thermal behaviour of (C4mim)2CuCl3

2016 ◽  
Vol 45 (8) ◽  
pp. 3327-3333 ◽  
Author(s):  
Philipp Zürner ◽  
Horst Schmidt ◽  
Sebastian Bette ◽  
Jörg Wagler ◽  
Gero Frisch
Keyword(s):  
Ionic Liquid ◽  
Thermal Behaviour ◽  
Liquid Glass ◽  
Crystalline Solid ◽  
Crystalline Phases

(C4mim)2CuCl3, which was investigated using crystallographic and thermoanalytical methods, forms an ionic liquid, a glass and three symmetry-related crystalline phases.

ChemInform Abstract: New Materials from High-Pressure Experiments

ChemInform ◽  
2010 ◽  
Vol 33 (47) ◽  
pp. no-no
Author(s):  
Paul F. McMillan
Keyword(s):  
High Pressure ◽  
New Materials
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