Bridgmanite

MgSiO3 (0% Fe)

Vinet · Original · 2015

Why this differs from similar rows?

Conditional fit with V0 fixed to 162.5 (typical measured value) rather than fitted freely, yielding a different K0=253.2; sibling row fits V0 freely.

V₀

162.5

Å³

Unit cell

K₀

253.200

GPa

Isothermal

K′

—

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
162.5	Å³	Unit cell	—

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	1
SiO2	1

Formula: MgSiO3

Conditions & method

T_ref: 300 K
P_ref: —
Structure: orthorhombic perovskite (Pbnm/Pnma)
Method: unknown
conditional equation of state fit to reanalyzed Tange et al. [2012] data with V0 fixed
Sample: Fe-free bridgmanite, conditional fit with V0 fixed to typical measured value (this study)

Source

Paper: The thermal equation of state of (Mg, Fe)SiO3bridgmanite (perovskite) and impli…
Authors: Aaron S. Wolf; Jennifer M. Jackson; Przemeslaw K. Dera; Vitali B. Prakapenka
DOI: 10.1002/2015jb012108
Year: 2015
Journal: Journal of Geophysical Research Solid Earth
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

If we compute the conditional equation of state parameters for Fe-free bridgmanite (fixing V0 to its most typical measured value of 162.5 Å3), we get a low-pressure appropriate bulk modulus of K0T = 253.2 ± 4.4 GPa, in general agreement with previous diffraction studies.

Additional notes

note

Conditional low-pressure-appropriate parameters; corresponding computed adiabatic modulus KS0 = 255.7 ± 4.4 GPa at 0 GPa and 300 K via KS = KT(1 + αγT)