Ferropericlase
(Mg0.75,Fe0.25)O
third-order Birch-Murnaghan · Original · 2011
Why this differs from similar rows?
V0/K_T0 correspond to the low-spin (LS) ferropericlase state; sibling row is the high-spin (HS) state with a different, fixed V0/K_T0.
V₀
74.4
ų
Unit cell
K₀
166
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 74.4 | 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 | 0.75 |
| FeO | 0.25 |
Formula: (Mg0.75Fe0.25)O
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron X-ray diffraction in laser-heated diamond anvil cell
- Sample
- polycrystalline ferropericlase mixed with 5 wt.% Au
Source
- Paper
- Thermal equation of state of lower-mantle ferropericlase across the spin crosso…
- Authors
- Zhu Mao; Jung‐Fu Lin; Jin Liu; Vitali B. Prakapenka
- DOI
- 10.1029/2011gl049915
- Year
- 2011
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
A third order isothermal Birch-Murnaghan EoS with a fixed K'0 = 4 has been used to fit the P-V data at 300 K to derive the unit cell volume, V0, and isothermal bulk modulus, KT0, yielding: ... V0 = 74.4 (±0.6) Å3 and KT0 = 166 (±7) GPa for the LS state
Additional notes
dK dT P
-0.014 (±0.002) GPa/K
alpha0
3.37 (±0.05) (10^-5 K^-1)
pressure calibrant
Au [Fei et al., 2007b]
P range
up to 140 GPa
T range
300 K to 2000 K