Bridgmanite
(Mg1-x,Fex)SiO3 (fit performed on pure MgSiO3 P-V-T data)
third-order Birch-Murnaghan · Original · 1996
V₀
24.46
cm³/mol
Molar
K₀
261
GPa
Isothermal
K′
3.750
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 24.46 | 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: (Mg1-xFex)SiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)in situ X-ray diffraction (P-V-T data up to 29 GPa and 2000 K), least-squares fitting
- Sample
- Table 1, (Mg1-x,Fex)SiO3 perovskite; P-V-T data of Wang et al. (1994), Utsumi et al. (1995), Funamori et al. (1996)
Source
- Paper
- Chemical composition of the lower mantle inferred from the equation of state of…
- Authors
- Takehiko Yagi; Nobumasa Funamori
- DOI
- 10.1098/rsta.1996.0053
- Year
- 1996
- Journal
- Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Table 1: (Mg1-x,Fex)SiO3 perovskite — K0 (GPa) 261; K' 3.75; T0 (K) 300; V0 (cm3 mol-1) 24.46 + 1.03x; θD0 (K) 1030; γ0 1.37 (3); q 0.6 (4). Text: 'The bulk modulus was fixed at K0 = 261 GPa (Mao et al. 1991), as in the previous study (Funamori et al. 1996). The pressure derivative of the bulk modulus, K'0, was fixed at either 4 or 3.75'.
Additional notes
theta D0 K
1030
theta D0 source
Akaogi & Ito (1993), heat capacity measurement
gamma0
1.37 (3)
q
0.6 (4)
K0 source
Mao et al. (1991)
note
gamma0 and q fitted; six parameter sets explored combining K'0 (4 or 3.75), θD0 (fixed 1030 K or free), and EOS choice; 200 P-V-T data used