Bridgmanite
MgSiO3
Vinet · Original · 2012
Why this differs from similar rows?
Alternative fit constraining KS0 to 253 GPa from Brillouin/ultrasonic literature; authors note it deviates systematically from the volume data vs. the unconstrained fit (sibling row).
V₀
162.373
ų
Unit cell
K₀
250.600
GPa
Isothermal
K′
4.420
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 162.373 | 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
- 300 K
- Pref
- —
- Structure
- perovskite (unspecified)
- Method
- experiment (XRD / DAC / multianvil compression)least squares fit to P-V-T XRD data with KS0 value of 253 GPa included in the analyses
- Sample
- alternative fit constrained by KS0 = 253 GPa from Brillouin/ultrasonic literature
Source
- Paper
- P‐V‐T equation of state of MgSiO3 perovskite based on the MgO pressure scale: A…
- Authors
- Yoshinori Tange; Yasuhiro Kuwayama; Tetsuo Irifune; Ken‐ichi Funakoshi; Yasuo Ohishi
- DOI
- 10.1029/2011jb008988
- Year
- 2012
- Journal
- Journal of Geophysical Research Atmospheres
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
'Including the KS0 value of 253 GPa in the current analyses, KT0 and K'T0 are determined as KT0 = 250.6 GPa and K'T0 = 4.42(2) (Vinet) and 4.458(15) (third-order Birch-Murnaghan)... However, the combination of small KT0 (~251 GPa) and large K'T0 (~4.4) shows a systematic deviation compared to the original volume data.'
Additional notes
note
Alternative constrained fit; authors state it deviates systematically from original volume data and prefer Table 2 parameters
KS0 constraint GPa
253
V0 source
fixed V0 of 162.373 Å3 from Tange et al. [2009b] used in the analyses