Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.221..421p&link_type=abstract
Earth and Planetary Science Letters, Volume 221, Issue 1-4, p. 421-431.
Physics
22
Functional Theory, Stishovite, Δ-Alooh, Nominally Anhydrous Silicates, Solid Solution
Scientific paper
First-principles calculations of stishovite (SiO2), δ-AlOOH, and stishovite-δ-AlOOH solid solutions reveal that coupled substitutions of Al3+ and H+ for Si4+ provide a means for dissolving significant amounts of hydrogen in stishovite under lower-mantle conditions. The enthalpy of solution is positive, decreasing in magnitude with increasing pressure. Combining our results with a model of the configurational entropy we find that the solubility of water in stishovite exceeds 0.3 wt% H2O at 25 GPa and 1500 K, realistic temperatures for subducting slabs, and that the solubility increases with increasing pressure and temperature. We predict asymmetric hydrogen bonding in the stishovite-δ-AlOOH solid solution that becomes increasingly symmetric with increasing pressure. Our results support the recently predicted symmetric hydrogen bonding in δ-AlOOH, and indicate that symmetric hydrogen bonding may be stable at ambient conditions in this material.
Panero Wendy R.
Stixrude Lars P.
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