Post-perovskite
MgSiO3
third-order Birch-Murnaghan · Original · 2009
V₀
162.2
ų
Unit cell
K₀
225
GPa
Adiabatic
K′
4.210
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 162.2 | ų | Unit cell | — |
Reported value and unit are preserved as extracted. Z (formula units per cell) is not stored yet, so molar ↔ ų/f.u. conversion is not applied automatically.
Composition
| Oxide | Molar |
|---|---|
| MgO | 1 |
| SiO2 | 1 |
Formula: MgSiO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- post-perovskite (CaIrO3-type, Cmcm)
- Method
- experiment (shock wave)global inversion of shock wave and static compression data
- Sample
- global inversion of static P-V-T data of Guignot et al. [2007] plus six shock experiments in the postperovskite regime
Source
- Paper
- The MgSiO3system at high pressure: Thermodynamic properties of perovskite, post…
- Authors
- J. L. Mosenfelder; Paul D. Asimow; D. J. Frost; D. C. Rubie; Thomas J. Ahrens
- DOI
- 10.1029/2008jb005900
- Year
- 2009
- Journal
- Journal of Geophysical Research Atmospheres
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
'The shock and static data can be fit together using a third-order Birch-Murnaghan isentrope for Ps, with V0 fixed to 162.2 Å3 [Guignot et al., 2007]. We obtain K0S = 225(2) GPa and K'0S = 4.21(7)'; Table 4: Postperovskite, Model BM3, V, Å3 162.2, K0S, GPa 225(2), K'0S 4.21(7)
Additional notes
gamma0
2.61(67)
q
2.1(8)
Cvm J per K per g
1035(50)
theta0 K
990(146)
reduced chi2
0.18
V0 source
Guignot et al. [2007]
abstract note
shock data constrain a value of K' significantly larger than 4