Migration Paths of Helium in -Quartz and Vitreous Silica
from Molecular Dynamics Data

G. G. Boiko and G. V. Berezhnoi

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Received July 19, 2002

Abstract—The helium diffusion in -quartz and vitreous silica is studied by the molecular dynamics method.
It is shown that, as the temperature increases, the motion of a helium atom in crystalline quartz changes over
from vibratory motion about the equilibrium position at 300 K to free displacements throughout the bulk of the
crystal at 750 K. The helium diffusion in -quartz and vitreous silica is described. It is demonstrated that even
an insignificant number of structural defects increases the helium mobility.

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