Bridgmanite
Fe0.5Mg0.5Al0.5Si0.5O3
second-order Birch-Murnaghan · Original · 2023
Why this differs from similar rows?
Values for the LiNbO3-type structure, stable below 8+/-2 GPa; sibling row 1294 is the distorted-perovskite phase stable above that transition pressure.
V₀
266.35
ų
Unit cell
K₀
211
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 266.35 | 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 |
| FeO | 0.08 |
| Fe2O3 | 0.21 |
| Al2O3 | 0.25 |
| SiO2 | 0.5 |
Formula: Fe0.5Mg0.5Al0.5Si0.5O3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (XRD / DAC / multianvil compression)single-crystal X-ray diffraction in diamond anvil cell (ID15B, ESRF)
- Sample
- single crystal synthesized in Kawai-type multi-anvil press
Source
- Paper
- Crystal chemistry and compressibility of Fe0.5Mg0.5Al0.5Si0.5O3 and FeMg0.5Si0.…
- Authors
- Iuliia Koemets; Biao Wang; Egor Koemets; Takayuki Ishii; Zhaodong Liu; Catherine McCammon; Artem Chanyshev; Tomo Katsura; Michael Hanfland; Alexander Chumakov; Leonid Dubrovinsky
- DOI
- 10.3389/fchem.2023.1258389
- Year
- 2023
- Journal
- Frontiers in Chemistry
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Fe0.5Mg0.5Si0.5Al0.5O3 is stable in the LiNbO3-type structure below 8 ± 2 GPa. The BM2–EoS fitting gives K0 = 211 ± 10 GPa and V0 = 266.35 ± 0.08 Å3.
Additional notes
Kp note
K′ = 4 is implied by the second-order Birch–Murnaghan EoS truncation; not explicitly stated as a number in the text
ambient lattice parameters
a = b = 4.8790(1) Å, c = 12.9112(1) Å
stability range
stable below 8 ± 2 GPa