Periclase
MgO
third-order Birch-Murnaghan · Original · 2001
Why this differs from similar rows?
Fit with K0T fixed to 160.2 GPa from high-precision sound-velocity measurements, giving V0=74.71 and K'=3.99; marked preferred fit. Sibling row fits K0T freely.
V₀
74.71
ų
Unit cell
K₀
160.200
GPa
Isothermal
K′
3.990
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 74.71 | 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 | 1 |
Formula: MgO
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- B1 rocksalt (Fm-3m)
- Method
- experiment (XRD / DAC / multianvil compression)energy dispersive synchrotron X-ray diffraction in diamond anvil cell, quasi-hydrostatic, 300 K; K0T fixed from sound velocity measurements
- Sample
- pure MgO powder, DAC with methanol-ethanol (to 10 GPa) or helium (to 52 GPa) medium
Source
- Paper
- Quasi‐hydrostatic compression of magnesium oxide to 52 GPa: Implications for th…
- Authors
- S. Speziale; Chang‐Sheng Zha; T. S. Duffy; Russell J. Hemley; Ho‐kwang Mao
- DOI
- 10.1029/2000jb900318
- Year
- 2001
- Journal
- Journal of Geophysical Research Atmospheres
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
By fixing K0T = 160.2 ± 0.2 GPa from high-precision sound velocity measurements (Table 2) we can obtain: K0T' = 3.99 ± 0.01 and V0 = 74.71 ± 0.01. Abstract: Fixing the bulk modulus K0T = 160.2 GPa, a fit of the data to the third-order Birch-Murnaghan equation of state yields: V0 = 74.71 ± 0.01 ų, (∂K0T/∂P)T = 3.99 ± 0.01.
Additional notes
preferred fit
True
thermal EOS parameters
Birch-Murnaghan-Debye: γ0 = 1.524 ± 0.025, q0 = 1.65 ± 0.4 (thermodynamic constraint), θ0 = 773 K; model with q decreasing from 1.65 at 0.1 MPa to 0.01 at 200 GPa