Abstract
The solubility of hydrogen in amorphous Mg0.6SiO2.6 at a temperature of 250°C and pressures up to 75 kbar is studied using a quenching technique. The molar ratio H2/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 Mg0.6SiO2.6 in the form of H2 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 Mg0.6SiO2.6 at P ≈ 52.5 kbar to a denser amorphous modification.
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Published in Russian in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 151, No. 6, pp. 1073–1079.
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Efimchenko, V.S., Barkovskii, N.V., Fedotov, V.K. et al. Hydrogen solubility in amorphous Mg0.6SiO2.6 at high pressure. J. Exp. Theor. Phys. 124, 914–919 (2017). https://doi.org/10.1134/S1063776117050028
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DOI: https://doi.org/10.1134/S1063776117050028