Hydrogen solubility in amorphous Mg{sub 0.6}SiO{sub 2.6} at high pressure

The solubility of hydrogen in amorphous Mg{sub 0.6}SiO{sub 2.6} at a temperature of 250°C and pressures up to 75 kbar is studied using a quenching technique. The molar ratio H{sub 2}/formula unit is found to nonlinearly increase with pressure from x = 0.12 at P = 10 kbar to x = 0.303 at P = 75 kbar....

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Bibliographic Details
Published inJournal of experimental and theoretical physics Vol. 124; no. 6
Main Authors Efimchenko, V. S., Barkovskii, N. V., Fedotov, V. K., Meletov, K. P.
Format Journal Article
LanguageEnglish
Published United States 15.06.2017
Subjects
ARGENTINA
HYDROGENATION
MATERIALS SCIENCE
NANOTECHNOLOGY
PHASE TRANSFORMATIONS
PRESSURE RANGE MEGA PA 10-100
RAMAN SPECTROSCOPY
SOLUBILITY
X-RAY DIFFRACTION
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Summary:The solubility of hydrogen in amorphous Mg{sub 0.6}SiO{sub 2.6} at a temperature of 250°C and pressures up to 75 kbar is studied using a quenching technique. The molar ratio H{sub 2}/formula unit is found to nonlinearly increase with pressure from x = 0.12 at P = 10 kbar to x = 0.303 at P = 75 kbar. An investigation of the quenched samples by Raman spectroscopy demonstrated that hydrogen dissolves in amorphous Mg{sub 0.6}SiO{sub 2.6} in the form of H{sub 2} molecules. X-ray diffraction and Raman studies showed that the hydrogenation of the samples is likely to be accompanied by a phase transition in the amorphous lattice of Mg{sub 0.6}SiO{sub 2.6} at P ≈ 52.5 kbar to a denser amorphous modification.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776117050028