Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 1999
Why this differs from similar rows?
Model 1 fit: thermal expansivity fitted to Anderson's (1998) data (Eq. 14); sibling row (Model 2) uses a different dataset (Funamori et al. 1996, Eq. 20), giving a different K0.
V₀
24.45
cm³/mol
Molar
K₀
261
GPa
Isothermal
K′
4
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
- 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 parameters at 300 K are: a = 1.1 x 10^-5, K0 (bulk modulus) = 261 GPa, K0' = 4 and (dK/dT)P = -0.027. ... Table 2. Data calculated using Model 1: T=300.00, KT=260.51 GPa, V(mol)=24.45 cm3. Model 1 employs Equations 14 and 17.
Additional notes
dK dT P
-0.027 (GPa/K)
alpha 300K
1.1 x 10^-5 (1/K)
alpha T Model1
alpha_T = 2.71 x 10^-5 + 1.80 x 10^-9 T - 1.48 T^-2 (Eq. 14, fitted to Anderson's 1998 data)
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)
Kp T dependence
(dKT/dP)T = K'300 + K4(T-300)ln(T/300) (Eq. 6, HTB-M model)
KT 300K Table2
260.51 GPa
Ks 300K Table2
261.26 GPa
gamma th 300K Table2
0.89