Bridgmanite
MgSiO3
second-order Birch-Murnaghan · Original · 2006
V₀
162.51
ų
Unit cell
K₀
253
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 162.51 | 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 |
| SiO2 | 1 |
Formula: MgSiO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)single-crystal X-ray diffraction in diamond-anvil cell up to 10 GPa
- Sample
- single crystal synthesized at 24-25 GPa and 1750-2000°C in multi-anvil press (Bayerisches Geoinstitut)
Source
- Paper
- Crystal structure and equation of state of MgSiO3 perovskite
- Authors
- C. B. Vanpeteghem; Jing Zhao; R. J. Angel; Nancy L. Ross; Nathalie Bolfan‐Casanova
- DOI
- 10.1029/2005gl024955
- Year
- 2006
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
"As all data points lie on a horizontal line (constant F), K'0 = 4 within the experimental uncertainties. The P-V data were therefore fit with a 2nd order Birch-Murnaghan equation of state to obtain K0 = 253 (±1) GPa and a room-pressure volume V0 = 162.51(2) Å^3."
Additional notes
measured ambient volume
162.57(2) Å^3 at 0.01(7) GPa (Table 1)
derived adiabatic KS
255 GPa via KT = KS/(1 + αγT) with α = 2.3e-5 K^-1, γ = 1.4, T = 300 K
axial compressibilities
βa = 1.44(2)e-3 GPa^-1, βb = 1.14(3)e-3 GPa^-1, βc = 1.38(2)e-3 GPa^-1