Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 1999
Why this differs from similar rows?
Model 2 fit: thermal expansivity fitted to Funamori et al. (1996) data (Eq. 20), unlike sibling row (Model 1) which uses Anderson's (1998) data (Eq. 14).
V₀
24.45
cm³/mol
Molar
K₀
260.510
GPa
Isothermal
K′
—
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 24.45 | cm³/mol | Molar | — |
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
- 300 K
- Pref
- 0.000 GPa
- Structure
- perovskite (unspecified)
- Method
- experiment (XRD / DAC / multianvil compression)in-situ synchrotron X-ray diffraction in externally heated diamond-anvil cell, 36-110 GPa, up to ~1500 K; combined with literature P-V-T data (thermal expansivity based on Funamori et al. 1996)
- Sample
- natural enstatite (Stakholmen, Hälsingland, Sweden; <1% Al and Fe) transformed to perovskite, DAC with Pt pressure marker
Source
- Paper
- Equation of state of MgSiO 3 with the perovskite structure based on experimenta…
- Authors
- Surendra K. Saxena; Leonid Dubrovinsky; Faramarz Tutti; Tristan Le Bihan
- DOI
- 10.2138/am-1999-0303
- Year
- 1999
- Journal
- American Mineralogist
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
The second model uses Equations 20 and 17. ... Table 3. Data calculated using Model 2: T=300.00, KT=260.51 GPa, V(mol)=24.45 cm3. alpha_T = 2.13 x 10^-5 + 7.57 x 10^-9 T - 1.02 T^-2 (fitted to Funamori et al. 1996).
Additional notes
alpha T Model2
alpha_T = 2.13 x 10^-5 + 7.57 x 10^-9 T - 1.02 T^-2 (Eq. 20, fitted to Funamori et al. 1996)
beta T
beta = 3.735 x 10^-7 + 3.27 x 10^-11 T + 6.60 x 10^-15 T^2 (Eq. 17, data of Fiquet et al. 1998)
Ks 300K Table3
260.81 GPa
gamma th 300K Table3
0.99
alpha 300K Table3
1.22 x 10^-6/K units column labeled 10^-6/K (Table 3)