Post-perovskite
MgGeO3
third-order Birch-Murnaghan · Cited · 2025
V₀
179.2
Unknown basis
K₀
207
GPa
Isothermal
K′
4.400
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 179.2 | — | 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 |
|---|---|
| MgO | 1 |
| GeO2 | 1 |
Formula: MgGeO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- post-perovskite (CaIrO3-type, Cmcm)
- Method
- experiment (Brillouin / ultrasonic / elasticity)literature values (adopted for regression of Brillouin scattering velocity data)
- Sample
- MgGeO3 post-perovskite (analogue for MgSiO3 post-perovskite), literature values adopted for velocity regression
Source
- Paper
- The texture of the post-perovskite phase controls the characteristics of the D”…
- Authors
- Motohiko Murakami; S. Kobayashi; Naohisa Hirao; Tomofumi Kawadai
- DOI
- 10.1038/s43247-025-02383-1
- Year
- 2025
- Journal
- Communications Earth & Environment
- Origin
- Cited (quoted from earlier work)
Evidence from the paper
we fitted three different data series using third-order finite Eulerian equations as shown in Fig. 3b. For this regression, we adopted the zero pressure volumes (V0Pv = 182.2^28, V0PPv = 179.2^29), isothermal bulk moduli (K0Pv = 229 GPa^28, K0PPv = 207 GPa^29) and pressure derivatives of the bulk modulus (K'0Pv = 3.7^28, K'0PPv = 4.4^29) from the previous literatures.
Additional notes
reference
cited from ref. 29
note
MgGeO3 used as low-pressure analogue for MgSiO3 post-perovskite in the D" layer; V0 unit not explicitly stated in the text