Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 2021
Why this differs from similar rows?
For comparison, K_T0 obtained instead from a separate fit to unit-cell volumes with pressures from the ruby scale of Jacobsen et al. (2008), using EOSFit software; text notes it agrees with the primary K_T-V fit (sibling row).
V₀
—
Unknown basis
K₀
255
GPa
Isothermal
K′
3.800
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| — | — | 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 |
| SiO2 | 1 |
Formula: MgSiO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)single-crystal X-ray diffraction unit-cell volumes with pressures from ruby pressure scale of Jacobsen et al. (2008), fitted with EOSFit software
- Sample
- single crystals synthesized at 25 GPa and 1573 K (multianvil LVP)
Source
- Paper
- Single‐Crystal Elasticity of MgSiO3 Bridgmanite to Mid‐Lower Mantle Pressure
- Authors
- Giacomo Criniti; Alexander Kurnosov; Tiziana Boffa Ballaran; D. J. Frost
- DOI
- 10.1029/2020jb020967
- Year
- 2021
- Journal
- Journal of Geophysical Research Solid Earth
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
For comparison, we also fitted a third-order Birch-Munraghan EOS to the experimental bridgmanite unit cell volumes using pressures determined from the ruby pressure scale of Jacobsen et al. (2008), and the EOSFit software ... The obtained fitting parameters of K_T0 = 255(10) GPa and K'_T0 = 3.8(2) are in good agreement with the values determined in the K_T-V fit reported above.