Bridgmanite
(Mg1-x,Fex)SiO3 enstatite in perovskite structure
unknown · Cited · 2000
V₀
—
Unknown basis
K₀
263
GPa
Unknown
K′
—
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 | 0.847 |
| FeO | 0.076418 |
| Fe2O3 | 0.016778 |
| CaO | 0.033287 |
| Al2O3 | 0.043292 |
| SiO2 | 1 |
Formula: (Mg1-xFex)SiO3
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- perovskite (unspecified)
- Method
- experiment (shock wave)shock compression (two-stage light-gas gun, optical analyzer sound velocity measurement); K0 taken from literature
- Sample
- natural enstatite from Damaping Mine, Zhangjiakou, Hebei Province; shocked to perovskite structure; initial sample density rho0 = 3.08 g/cm3
Source
- Paper
- Temperature Coefficient of Sound Velocity of Perovskite-Enstatite and Lateral T…
- Authors
- Zizheng Gong; Hongsen Xie; Fuqian Jing; Yonggang Liu; Jie Guo; Jian Xu
- DOI
- 10.1088/0256-307x/17/3/022
- Year
- 2000
- Journal
- Chinese Physics Letters
- Origin
- Cited (quoted from earlier work)
Evidence from the paper
"the initial parameters: alpha0 = 1.6x10^-5, K0 = 263 GPa, deltaT = 4.5, gamma = gamma0(rho0/rho), gamma0 = 1.4, come from Ref. 15."
Additional notes
alpha0
1.6x10^-5 (bulk thermal expansion coefficient at zero pressure)
delta T
4.5
gamma0
1.4
gamma model
gamma = gamma0(rho0/rho)
rho0 initial sample
3.08 g/cm3
dK dT this paper
-0.0279 GPa·K^-1 (average of extrapolations from 40-140 GPa shock data, ~6000 K, 140 GPa)
dK dT cited values
{
"Stixrude et al. (Ref 7)": "-0.060 GPa·K^-1 (900 K, 30 GPa)",
"Wang et al. (Ref 8)": "-0.023 GPa·K^-1 (1300 K, 11 GPa)",
"Funamori et al. (Ref 9)": "-0.028 GPa·K^-1 (2000 K, 30 GPa)",
"Utsumi et al. (Ref 10)": "-0.030 GPa·K^-1 (2500 K, 20 GPa)",
"Figuet et al. (Ref 11)": "-0.027 GPa·K^-1 (2500 K, 57 GPa)"
}
hugoniot eos
D = 4.83(±0.42) + 1.22(±0.10) uP (km/s), shock-particle velocity relation, not a static EOS
note
No V0 or K' reported; K0 = 263 GPa is a literature parameter (Ref. 15) used as input, not fitted in this study