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Migration Paths of Helium in α-Quartz and Vitreous Silica from Molecular Dynamics Data
      
The helium diffusion in α-quartz and vitreous silica is studied by the molecular dynamics method.
      
The helium diffusion in α-quartz and vitreous silica is described.
      
Empirical relationships describing the composition dependences of the chemical durability of glasses in the diopside-albite, diopside-anorthite, diopside-orthoclase, diopside-quartz, and diopside-feldspar systems are derived.
      
A detailed examination of the experimental and model ARDFs has revealed that the interatomic distances for all atoms belonging to one helical chain in the glass are identical to those in the β-quartz crystal over the entire ordering range.
      
The illite from the earliest and predominant chlorite-illite-quartz metasomatite is characterized by the least δD values of -(50-85)‰ and δ18O=7-11‰.
      
As a result, the pyrophyllite-quartz metasomatite was formed; the pyrophyllite and illite schists originated in tectonic compression zones.
      
In sodic rocks, gold-quartz veins and stringer zones are formed as a result of elisional and catagenetic transformations.
      
It is shown that glauconite-quartz sandstones of the Upper Riphean P?r?jarvi Formation (Srednii Peninsula, Murmansk coast of the Barents Sea) are subjected to deep catagenesis.
      
According to this classification, the petrochemical types A-E may be correlated with monomictic (A'), oligomictic (B'), and mesomictic (C') sandstones, feldspar-quartz graywacke (D') and graywacke proper (E'), respectively.
      
As an illustration, a 100-MHz transducer formed by a (Y+36°)-cut LiNbO3 plate fixed on a fused-quartz acoustic duct with the help of five metal layers is considered.
      
The measurements were performed by the resonance method on crystals grown on α-quartz seeds from solutions in the recirculating mode.
      
New acentric borate possesses optical nonlinearity comparable with the optical nonlinearity of α-quartz.
      
Twisting of α-quartz tetrahedra at pressures near the transition to the amorphous state
      
It is found that the main contribution to the distortion of α-quartz tetrahedra at high pressures is their twisting.
      
The dynamical Laue diffraction has been studied for a direct beam diffracted from a thin (~3.5 cm) α-quartz crystal at the Bragg angles close to 90°.
      
The depolarization of a neutron beam executing Laue diffraction in a thick (~3.5 cm) noncentrosymmetric α-quartz crystal is observed.
      
A similar effect is predicted for a positronium in crystalline quartz at temperatures above the transition from α-to β-quartz (846 K).
      
It is shown that the characteristic magnitude of the effect for α-quartz is ?(1-2)×10-4 rad/cm over a wide wavelength range (from 2.8 to 5.5 ?) and is determined by the degree of beam monochromaticity [Δλ/λ=(2-5)×10-2 in our experiment].
      
The sizes of the irradiated surface regions of a sample in the proton and laser experiments are the same in order to provide the same thermal conditions in the sample-quartz transducer system.
      
 

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