Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 2021
Why this differs from similar rows?
K_TR0 obtained by converting the measured K_SR to K_TR via thermoelastic relations and fitting a BM3 to the resulting K_T-V data, with absolute pressure from simultaneous Brillouin scattering and XRD.
V₀
—
Unknown basis
K₀
254.500
GPa
Isothermal
K′
3.730
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 (Brillouin / ultrasonic / elasticity)K_SR converted to K_TR using thermoelastic relations; fit to K_T–V data from simultaneous Brillouin scattering and X-ray diffraction (absolute pressure determination)
- 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
we converted our experimentally determined K_SR into K_TR and calculated K_TR0 and K'_TR0 by fitting a third-order Birch-Munraghan EOS to our K_T-V data. ... The absolute pressure was then determined using experimentally measured volumes, and our K_TR0 = 254.5(4) GPa and K'_TR0 = 3.73(2).