Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..139...45r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 139, Issue 1-2, p. 45-54.
Physics
17
Scientific paper
The viscosity of CaMgSi2O6 (diopside) liquid has been determined up to 13GPa and 2200°C using in situ falling sphere viscometry with X-ray radiography. The experiments were carried out in a 1500t multianvil apparatus at the SPring-8 synchrotron (Japan). A new, high-pressure sample assembly was developed with LaCrO3 replacing the traditionally used graphite furnace material, allowing experiments within the diamond stability field to be carried out. The viscosity of CaMgSi2O6 liquid increases slightly from 3.5 to 10GPa and then decreases slightly at higher pressures. However, over the entire ranges of temperature (2030-2473K) and pressure (3.5-13GPa) investigated, variation in viscosity does not exceed +/-0.5log units. The viscosity results from this study are consistent with those calculated from the pressure dependence of oxygen self-diffusion in CaMgSi2O6 liquid using the Eyring equation with a translation distance (λ) of 0.45nm providing the best correlation. Both sets of results indicate a change in pressure dependence at approximately 10GPa, where viscosity results show a maximum with pressure and silicon and oxygen self-diffusivity results show a minimum.
Funakoshi Ken-Ichi
Ohtani Eiji
Poe Brent T.
Reid Joy E.
Rubie David C.
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