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First principles determination of the phase boundaries of high-pressure polymorphs of silica

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Tsuchiya, T Caracas, R. Tsuchiya, J

We perform first principles calculations of three ordered high-pressure polymorphs of silica to investigate their phase equilibrium: stishovite, CaCl2 and alpha-PbO2. We use the density-functional linear response theory to calculate lattice dynamical properties and the quasiharmonic approximation to determine the high temperature phase boundaries. We obtain positive and almost parallel Clapeyron slopes for both the stishovite-CaCl2 and the CaCl2-alpha-PbO2 phase transitions: 56 + 0.006 T (GPa) and 106 + 0.006 T ( GPa), respectively. These boundaries are consistent with recent experimental results. The pressure and temperature conditions for the former transition correspond to the mid-lower mantle region where some minor seismic discontinuities have been observed. The latter transition corresponds to the pressure and temperature conditions associated with the lowermost mantle and the D" discontinuity. The stable form of silica at the bottom of mantle is the alpha-PbO2 structure.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2004
Language Anglais
Journal information "Geophysical Research Letters" - Vol. 31, no. 11 (2004)
Peer reviewed yes
Publisher Amer Geophysical Union (Washington)
issn 0094-8276
e-issn 1944-8007
Publication status Publié
Affiliation UCL
Links
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Bibliographic reference Tsuchiya, T ; Caracas, R. ; Tsuchiya, J. First principles determination of the phase boundaries of high-pressure polymorphs of silica. In: Geophysical Research Letters, Vol. 31, no. 11 (2004)
Permanent URL http://hdl.handle.net/2078.1/40132