Post-perovskite
(Mg,Fe)SiO3 with 9 mol.% FeSiO3
second-order Birch-Murnaghan · Original · 2006
Why this differs from similar rows?
Birch-Murnaghan fit with K'0 fixed at 4 (main reported fit); sibling row instead fixes K'0 = 4.4 to illustrate parameter tradeoffs.
V₀
164.9
ų
Unit cell
K₀
219
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 164.9 | 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 | 0.9 |
| FeO | 0.09 |
| CaO | 0.005 |
| Al2O3 | 0.0025 |
| SiO2 | 1 |
Formula: (Mg,Fe)SiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- post-perovskite (CaIrO3-type, Cmcm)
- Method
- experiment (XRD / DAC / multianvil compression)laser-heated diamond anvil cell, synchrotron x-ray diffraction, 300 K decompression, 12-106 GPa
- Sample
- ppv synthesized from natural orthopyroxene (Mg1.80Fe0.18Al0.01Ca0.01)Si2O6
Source
- Paper
- Equation of state of the postperovskite phase synthesized from a natural (Mg,Fe…
- Authors
- S. R. Shieh; T. S. Duffy; Atsushi Kubo; Guoyin Shen; Vitali B. Prakapenka; Nagayoshi Sata; Kei Hirose; Yasuo Ohishi
- DOI
- 10.1073/pnas.0506811103
- Year
- 2006
- Journal
- Proceedings of the National Academy of Sciences
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Fitting the pressure-volume data for the ppv phase to a Birch-Murnaghan EOS (20) yields a bulk modulus, K0, of 219(5) GPa and an ambient pressure volume, V0, of 164.9(6) ų for a bulk modulus pressure derivative, K'0, fixed at 4.
Additional notes
bulk modulus at 100GPa
575(15) GPa
bulk modulus at 120GPa
641(17) GPa
table column
Table 1, CaIrO3-type, This study, experiment