Bridgmanite
(Mg0.9,Fe0.1)SiO3
Birch-Murnaghan (order unspecified) · Original · 1992
V₀
24.56
cm³/mol
Molar
K₀
263
GPa
Isothermal
K′
3.900
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 24.56 | 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 | 0.9 |
| FeO | 0.1 |
| SiO2 | 1 |
Formula: (Mg0.9Fe0.1)SiO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- perovskite (unspecified)
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron x-ray diffraction in externally heated diamond anvil cell
- Sample
- Fig. 1 fit to x-ray diffraction data at room temperature
Source
- Paper
- Thermoelasticity of Silicate Perovskite and Magnesiowüstite and Stratification …
- Authors
- Lars Stixrude; Russell J. Hemley; Yingwei Fei; H. K. Mao
- DOI
- 10.1126/science.257.5073.1099
- Year
- 1992
- Journal
- Science
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Lines are based on the Birch-Murnaghan equation of state with a zero pressure volume V0 = 24.56 cm3 mol-1, isothermal bulk modulus K0 = 263 ± 7 GPa, and its pressure derivative K0' = 3.9 ± 0.4 (17).
Additional notes
theta0
1017 ± 7 K
gamma0
1.96 ± 0.10
q
2.5 ± 1.7
alpha0 mean 300 2000K
significantly larger than 4 × 10^-5 K^-1; 4.7 × 10^-5 K^-1 used in Eqs. 2 and 3
delta T
≈7
delta S
3
alphaKT
10.2 MPa K-1 (assumed independent of temperature above Debye temperature)