Application of classical nucleation theory indicates heterogeneous nucleation and one-dimensional (e.g., needlelike) growth. These first XRD data demonstrate rapid growth kinetics of ice VII with implications for fundamental physics of diffusion-mediated crystallization and thermodynamic modeling of collision...
Diffusion and electrical conductivity in water at ultrahigh pressures. Phys. Rev. B 82, 174108 (2010). Article ADS Google Scholar Mitchell, A. C. & Nellis, W. J. Equation of state and electrical conductivity of water and ammonia shocked to the 100 GPa (1 Mbar) pressure range. J. ...
Increasing the temperature in ice VII activates a dynamic orientational disorder of the H2O molecules19. Increasing both pressure and temperature leads to the combination of both orientational and translational motions of the H atoms and results in an onset of H diffusion characterizing the superionic ...
For pressures above approximately 45 Gpa, there is a sharp increase in the slope of the melting curve because of the presence of molecular dissociation and proton diffusion in the solid before melting. The onset of significant proton diffusion in ice-VII as a function of increasing temperature ...
The process of diffusion of these orientational defects makes it possible to reorient the water molecules with less activation energy than that of the pure ice. owing to the temporary break of the highly cooperative chain process. The hydroxyl ion of KOH can replace the water molecule in the ...
nism from “dislocation creep” to “diffusion creep” and “su- perplasticity,” which has important implications for the ther- mal evolution and internal dynamics of the icy satellites. 38,39 Hexagonal ice is produced by pippeting 500 l of deion- ...
It enables us to determine the self diffusion constant of proton (deuteron) from infrared reflection spectra collected as a function of time for a H 2 O/D 2 O ice bilayer prepared and pressurized in the DAC. A preliminary experiment for ice VII at 14 GPa and 400 K provided a diffusion ...
However, it has been shown through molecular dynamic (MD) simulations29 and Raman spectroscopy30 that molecular diffusion in ice VII is negligible, leaving only single-protonic motion as a possible reason for such sharp proton signals in ice VII. Considering the geometry of the symmetric double-...
the increase in the adsorbed gas observed at ∼240 mbar, after a 16.5 h-long exposure to hydrogen, indicates that at least two time scales dominate the phenomenon: one fast adsorption in the outermost sites of the channels and a slower one, limited by molecular diffusion, inside the...
This laboratory study evaluates an experimental set-up to study the immersion freezing properties of ice residuals (IRs) at a temperature ranging from −26 to −34 ◦C using two continuous-flow diffusion chamber-style ice nucleation chambers coupled with a virtual impactor and heat exchanger....