HYDROGEN DIFFUSION IN NATURAL AND SYNTHETIC ORTHOPYROXENE
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dc.contributor.author | Stalder R. | |
dc.contributor.author | Skogby H. | |
dc.date.accessioned | 2022-02-10T07:21:56Z | |
dc.date.available | 2022-02-10T07:21:56Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=1386108 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2003, 30, 1, 12-19 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35188 | |
dc.description.abstract | Hydrogen diffusion coefficients in natural orthopyroxenes and synthetic enstatite were determined by dehydration and hydration experiments at 700 and 900 °C. In natural Opx (approximately En90Fs10) small but significant differences in diffusivities along the three crystallographic axes were observed, [001] being the fastest direction, followed by [100] and [010]. Hydrogen diffusion in pure enstatite proved to be about 2 orders of magnitude slower and isotropic. The activation energy for hydrogen diffusion in pure enstatite was determined to be -295 (±55) kJmol-1, and -213 (±47) kJmol-1 for orthopyroxene from Kilbourne Hole. Long-term hydration experiments did not lead to saturation in hydrogen. Instead, after an initial increase in hydrogen concentration, a slow but continuing decrease could be observed in all cases. It is suggested that the investigated samples lose their ability to store hydrogen even when heated in a hydrogen atmosphere. This loss in storage ability can itself be described by a diffusion equation, its diffusion coefficients being more than 1 order of magnitude slower than the diffusion of hydrogen. | |
dc.subject | ENSTATITE | |
dc.subject | HYDROGEN DIFFUSION | |
dc.subject | INFRARED SPECTROSCOPY | |
dc.title | HYDROGEN DIFFUSION IN NATURAL AND SYNTHETIC ORTHOPYROXENE | |
dc.type | Статья |
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