Post-perovskite
MgSiO3
Keane · Original · 2016
Why this differs from similar rows?
'fit7' (preferred experimental EOS): V0 fixed to 164.26 A3 from the g-G plot, unlike the free V0 of fit5/fit6; text notes K-infinity' may be slightly misestimated in this fit.
V₀
164.26
ų/cell
Formula unit
K₀
203
GPa
Isothermal
K′
5.350
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 164.26 | ų/cell | Formula unit | — |
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 |
| SiO2 | 1 |
Formula: MgSiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- post-perovskite (CaIrO3-type, Cmcm)
- Method
- experiment (XRD / DAC / multianvil compression)LHDAC powder X-ray diffraction
- Sample
- fit7 (This study + Guignot et al. data, V0 fixed by g-G plot; preferred experimental EoS)
Source
- Paper
- Experimental and theoretical thermal equations of state of MgSiO3 post-perovski…
- Authors
- Takeshi Sakai; Haruhiko Dekura; Naohisa Hirao
- DOI
- 10.1038/srep22652
- Year
- 2016
- Journal
- Scientific Reports
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Table 1: 164.26*g fix | 203±2 | 5.35±0.09 | γ0=1.47±0.10 | γ∞=0.93 fix | β=2.7±0.3 | θ0=848±238 | K∞′=2.19 fix | fit7 | Exp., LHDAC | T-MgO(Keane). Text: 'the g-G plot yielded a V0 of ... 164.26 ± 0.42 Å3 for the Keane model' and 'In fit 7, the V0 was fixed to be 164.26 Å3'
Additional notes
fit number
fit7
V0 note
V0 fixed to value determined by g-G plot (164.26 ± 0.42 Å3 in text)
gamma0
1.47±0.10
gamma inf
0.93 fix
beta
2.7±0.3
theta0 K
848±238
K inf prime
2.19 fix
pressure scale
T-MgO(Keane): Tange et al. MgO scale
note
K∞′ does not satisfy Keane's rule; K0′ and K∞′ possibly slightly over- and underestimated in fit 7