Post-perovskite
MgGeO3
third-order Birch-Murnaghan · Original · 2006
V₀
179.2
ų
Unit cell
K₀
207
GPa
Isothermal
K′
4.400
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 179.2 | 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 |
| GeO2 | 1 |
Formula: MgGeO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- post-perovskite (CaIrO3-type, Cmcm)
- Method
- experiment (XRD / DAC / multianvil compression)in situ synchrotron x-ray diffraction, laser-heated diamond anvil cell (experiment)
- Sample
- MgGeO3 pPv synthesized from orthoenstatite + Pt, laser-heated DAC
Source
- Paper
- Stability and equation of state of the post‐perovskite phase in MgGeO3 to 2 Mbar
- Authors
- Atsushi Kubo; Boris Kiefer; Guoyin Shen; Vitali B. Prakapenka; R. J. Cava; T. S. Duffy
- DOI
- 10.1029/2006gl025686
- Year
- 2006
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
By this method, we constrained equation of state parameters of MgGeO3 pPv phase as K0 = 207 ± 5 GPa, V0 = 179.2 ± 0.7 Å3 with fixed K'0 of 4.4 (solid line in Figure 3). Table 2: MgGeO3 179.2(7) 207(5) 4.4 EXP, 1 (This study).
Additional notes
constraint
K0 and V0 constrained using semi-empirical elasticity systematics (K·V = const.) with MgSiO3 pPv reference values
pressure scale
Pt (Holmes et al. 1989), 111 reflection only
data range
data below 47 GPa excluded from EOS fit