Bridgmanite

(Mg0.92, Fe0.08)SiO3

third-order Birch-Murnaghan · Original · 2004

V₀

—

Unknown basis

K₀

260.100

GPa

Adiabatic

K′

4.180

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 wave compression (two-stage light gas gun), Hugoniot data reduced via Mie-Gruneisen / finite strain analysis
Sample: hot-pressed natural enstatite powder (Damaping mine, Hebei, China), shocked to perovskite phase

Source

Paper: Equation of state and phase stability of mantle perovskite up to 140 GPa shock …
Authors: Zizheng Gong; Yingwei Fei; Fu Long Dai; Li Zhang; Fuqian Jing
DOI: 10.1029/2003gl019132
Year: 2004
Journal: Geophysical Research Letters
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Using the third-order Birch-Murnaghan finite strain equation of state, the shock experimental data yield a zero-pressure bulk modulus K0s = 260.1(9) GPa and its pressure derivative K'0s = 4.18(4), with rho0 = 4.19 g/cm3. ... A linear least-squares fit of the calculated data yields K0S = 260.1(9) GPa and K'0S = 4.18(4), using the values of gamma above with rho0 = 4.19 g/cm3.

Additional notes

rho0

4.19 g/cm3 (zero-pressure density of perovskite phase used in fit)

gamma0

1.84(2)

1.69(3)

gamma relation

gamma = gamma0 (rho0/rho)^q, fitted from Hugoniot data

us up relation

us = 3.76(+-0.24) + 1.48(+-0.07) up (km/s)

pressure range

48 to 140 GPa shock pressure; data above 57.13 GPa represent perovskite phase

initial sample density

3.06 +- 0.01 g/cm3 (average bulk density, porosity 6.35%)

note

K0S and K'0S derived from shock (dynamic) compression data, not static compression; no unit-cell V0 reported, only rho0