Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 1996
Why this differs from similar rows?
From run 1 (enstatite single crystals, flux method); V0 fitted per run while K0/K' fixed to Mao et al. [1991] values, so only V0 differs from sibling run 2.
V₀
162.32
ų
Unit cell
K₀
261
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 162.32 | 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
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)in situ energy-dispersive X-ray diffraction, MA8-type multianvil with sintered diamond anvils, synchrotron radiation, 21-29 GPa, 300-2000 K
- Sample
- run 1 (synthesized from enstatite single crystals, flux method)
Source
- Paper
- Thermoelastic properties of MgSiO3 perovskite determined by in situ X ray obser…
- Authors
- Nobumasa Funamori; Takehiko Yagi; Wataru Utsumi; Tadashi Kondo; Takeyuki Uchida; Miho Funamori
- DOI
- 10.1029/95jb03732
- Year
- 1996
- Journal
- Journal of Geophysical Research Atmospheres
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
The V0 of run 1 and run 2 was 162.32 Å3 and 162.19 Å3, respectively. ... In the present study, we adopt the values of K300,0 = 261 GPa and K'300,0 = 4 determined by Mao et al. [1991] ... The optimal set of parameters of the third-order Birch-Murnaghan equation of state ... is K300,0 = 261 GPa, K'300,0 = 4, ... and (∂KT,0/∂T)P = -0.0280 GPa/K.
Additional notes
dK dT P
-0.0280(±0.0032) GPa/K (fitted)
alpha T0
a0 = 1.982e-5 K^-1, b0 = 0.818e-8 K^-2, c0 = 0.474 K
alpha 300 0 constraint
1.7e-5 K^-1 (fixed, from Wang et al. [1994])
alpha 25GPa
a25 = 2.11e-5 K^-1, b25 = 1.80e-9 K^-2, c25 = 1.93 K
fit data
combined data of this study (ND1, NaCl Decker scale), Wang et al. [1994], and Utsumi et al. [1995]
K0 Kp source
fixed to values of Mao et al. [1991]