Wüstite
Fe0.925O
third-order Birch-Murnaghan · Original · 2000
Why this differs from similar rows?
K0 derived using the (200) reflection alone for volume, preferred by authors due to anisotropic broadening under slightly non-hydrostatic conditions; sibling row uses 3 reflections.
V₀
—
Unknown basis
K₀
150
GPa
Unknown
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| — | — | Unknown basis | — |
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 |
|---|---|
| FeO | 0.925 |
Formula: Fe0.925O
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- B1 rocksalt (Fm-3m)
- Method
- experiment (XRD / DAC / multianvil compression)high-pressure synchrotron powder X-ray diffraction in diamond anvil cell (N2 pressure medium), data P <= 13 GPa
- Sample
- single-phase powder sample of Fe0.925O; volume from (200) reflection alone
Source
- Paper
- Effect of defect clustering on the high-pressure behaviour of wüstite. High-pre…
- Authors
- Camilla Haavik; Svein Stølen; Michael Hanfland; C. Richard A. Catlow
- DOI
- 10.1039/b006026g
- Year
- 2000
- Journal
- Physical Chemistry Chemical Physics
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
The zero-pressure bulk modulus of Fe0.925O was derived using a third-order Birch-Murnaghan equation of state. Only the P-V data for P <= 13 GPa were used in the analysis and K0' was fixed to 4. The volume of Fe0.925O was calculated by two approaches; by using the (200) reflection alone, and by using the (111), (200) and (220) reflections. The two approaches gave different values for the bulk modulus, K0 = 150 ± 10 GPa and K0 = 167 ± 10 GPa, respectively.
Additional notes
ambient lattice parameter
430.4 ± 0.2 pm at ambient conditions
note
The (200)-only value (150 GPa) is the one preferred by the authors due to anisotropic broadening from slightly non-hydrostatic conditions