Hydrogen Solubility in Amorphous Silica at Pressures up to 75 kbarстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:ABSTRACT: The solubility of hydrogen in amorphous silica at a temperature of 250 °C and
pressures up to 75 kbar is studied using a quenching technique. The molar ratio H2/SiO2 is found
to linearly increase with pressure from X = 0.16 at P = 6 kbar to X = 0.53 at P = 75 kbar. An
investigation of a sample with X = 0.47 by Raman spectroscopy demonstrated that hydrogen
dissolves in silica in the form of H2 molecules, and these molecules occupy voids of, at least, two
different types in the silica network. An X-ray diffraction study showed that the hydrogen
molecules penetrating in the silica glass network prevented its irreversible densification occurring
if the silica glass is compressed to the same pressure without hydrogen.