Bridgmanite

(Mg0.92, Fe0.08)SiO3

third-order Birch-Murnaghan · Original · 2004

V₀

—

Unknown basis

K₀

260.090

GPa

Adiabatic

K′

4.170

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 ↔ Å³/f.u. conversion is not applied automatically.

Composition

Oxide	Molar
MgO	0.92
FeO	0.08
SiO2	1

Formula: (Mg0.92Fe0.08)SiO3

Conditions & method

T_ref: —
P_ref: —
Structure: orthorhombic perovskite (Pbnm/Pnma)
Method: experiment (shock wave)
shock compression (Hugoniot, two-stage light gas gun) reduced via finite-strain F-f analysis
Sample: hot-pressed natural enstatite powder (Damaping Mine, Hebei, China), >98% enstatite, initial density 3.06 g/cm3 (crystal density 3.27 g/cm3)

Source

Paper: Equation of State, Phase Stability of (Mg0.92, Fe0.08)SiO3 Perovskite from Shoc…
Authors: Zizheng Gong
DOI: 10.1063/1.1780510
Year: 2004
Journal: AIP conference proceedings
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

A linear least squares fit of data in Fig.3 gives K0s=260.09GPa and pressure derivative K0s'=4.17, given our new value of γ, with ρ0=4.19g/cm3. ... By using the third-order Birch-Murnaghan finite strain equation of state (EOS), Our shock experimental data yield a zero-pressure bulk modulus.

Additional notes

rho0 zero pressure high pressure phase

4.19 g/cm3

Gruneisen gamma0

1.84

Gruneisen q

1.69

Gruneisen relation

gamma = gamma0 (rho0/rho)^q

Hugoniot D u relation

D = 3.76 + 1.48u (km/s), up to 140 GPa; conclusion section quotes D = 4.13 + 1.39u (km/s)

initial sample density

3.06 g/cm3 (abstract) / 3.08 g/cm3 (experiments section)

shock temperature range

about 1500-5000 K in experimental pressure range

note on Etr

Energy of transition to high-pressure phase E_tr unknown but has very small influence on K0s

no V0 reported

zero-pressure volume of high-pressure phase given only as density rho0 = 4.19 g/cm3, not as a unit-cell or molar volume