Bridgmanite
MgSiO3 (pure)
third-order Birch-Murnaghan · Original · 1996
V₀
—
Unknown basis
K₀
261
GPa
Isothermal
K′
4
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
- 300 K
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)in situ X-ray diffraction (P-V-T data up to 29 GPa and 2000 K), least-squares fitting
- Sample
- alternative least-squares parameter set with K'0 fixed at 4 (figures 4a, b)
Source
- Paper
- Chemical composition of the lower mantle inferred from the equation of state of…
- Authors
- Takehiko Yagi; Nobumasa Funamori
- DOI
- 10.1098/rsta.1996.0053
- Year
- 1996
- Journal
- Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
'The bulk modulus was fixed at K0 = 261 GPa (Mao et al. 1991)... The pressure derivative of the bulk modulus, K'0, was fixed at either 4 or 3.75'. 'In figures 4a, b, the results obtained by fixing for perovskite, K'0 = 4 and θD0 = 1030 K, and by fixing K'0 = 4 but letting θD0 be a free parameter, respectively, are shown.'
Additional notes
note
Variant parameter set of the Table 1 fit with K'0 = 4 instead of 3.75; Birch-Murnaghan-only analyses (figures 6a, b) also used K'0 = 4 and 3.75 with no meaningful differences in results