Bridgmanite
(Mg0.5Fe3+0.5)(Al0.5Si0.5)O3 (FA50)
second-order Birch-Murnaghan · Original · 2020
Why this differs from similar rows?
Sample 1, fit using both pre- and post-annealing data combined; authors state this denser, lower-uncertainty fit is their preferred/representative EoS (also quoted in the abstract), unlike the annealed-only fit (sibling row).
V₀
172.1
ų
Unit cell
K₀
229
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 172.1 | 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 | 0.5 |
| Fe2O3 | 0.25 |
| Al2O3 | 0.25 |
| SiO2 | 0.5 |
Formula: (Mg0.5Fe3+0.5)(Al0.5Si0.5)O3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- perovskite (unspecified)
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron powder XRD in laser-annealed diamond anvil cell (Au pressure calibrant, Ne medium)
- Sample
- Sample 1, fit to data before and after laser annealing (preferred EoS)
Source
- Paper
- Synthesis, Elasticity, and Spin State of an Intermediate MgSiO3‐FeAlO3 Bridgman…
- Authors
- Feng Zhu; Jiachao Liu; Xiaojing Lai; Yuming Xiao; Vitali B. Prakapenka; Wenli Bi; E. Ercan; Przemysław Dera; Bin Chen; Jie Li
- DOI
- 10.1029/2020jb019964
- Year
- 2020
- Journal
- Journal of Geophysical Research Solid Earth
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
fitting both the data before and after laser annealing (gray and red squares in Figure 3) yields V0 = 172.1(4) ų, K0 = 229(4) GPa with K0' = 4(fixed). ... the second EoS with a denser data coverage and smaller uncertainties was used to represent the EoS for thermodynamically stable structure and ordering of FA50 sample.
Additional notes
note
This EoS also quoted in the abstract as the representative EoS of FA50 bridgmanite