Bridgmanite
(Mg0.9Fe0.1)SiO3
third-order Birch-Murnaghan · Original · 2015
V₀
162.6
ų
Unit cell
K₀
284
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 162.6 | 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 | 0.1 |
| SiO2 | 1 |
Formula: (Mg0.9Fe0.1)SiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- perovskite (unspecified)
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron X-ray diffraction in diamond anvil cells (Ne pressure medium, Pt pressure calibrant), up to 125 GPa
- Sample
- Pv10 (10 mol.% Fe, ~20% of total Fe as Fe3+ in B site), presynthesized polycrystalline sample
Source
- Paper
- Effects of the Fe3+ spin transition on the equation of state of bridgmanite
- Authors
- Zhu Mao; Jung‐Fu Lin; Jing Yang; Toru Inoue; Vitali B. Prakapenka
- DOI
- 10.1002/2015gl064400
- Year
- 2015
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Using the derived width of the spin transition, the P-V data above 25 GPa fitted to the third-order Birch-Murnaghan EoS yield the isothermal bulk modulus, K_T0 = 284 (±4) GPa, and unit cell volume, V0 = 162.6 (±0.3) Å3, with a fixed K_T0' = 4 for Pv10 with the LS B site Fe3+.
Additional notes
fit pressure range
P-V data above 25 GPa (up to 125 GPa)
spin transition range
spin transition of B-site Fe3+ starts at 18 GPa and completes at 25 GPa
volume reduction at transition
0.5(±0.1)% reduction in unit cell volume at 18–25 GPa
pressure scale
Pt scale of Fei et al. [2007a]