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Bridgmanite

MgSiO3

third-order Birch-Murnaghan · Original · 1999

Why this differs from similar rows?

Model 2 fit: thermal expansivity fitted to Funamori et al. (1996) data (Eq. 20), unlike sibling row (Model 1) which uses Anderson's (1998) data (Eq. 14).

V₀
24.45
cm³/mol
Molar
K₀
260.510
GPa
Isothermal
K′
dimensionless

Volume (V₀)

Value Unit Basis Z
24.45 cm³/mol Molar

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

OxideMolar
MgO1
SiO21

Formula: MgSiO3

Conditions & method

Tref
300 K
Pref
0.000 GPa
Structure
perovskite (unspecified)
Method
experiment (XRD / DAC / multianvil compression)
in-situ synchrotron X-ray diffraction in externally heated diamond-anvil cell, 36-110 GPa, up to ~1500 K; combined with literature P-V-T data (thermal expansivity based on Funamori et al. 1996)
Sample
natural enstatite (Stakholmen, Hälsingland, Sweden; <1% Al and Fe) transformed to perovskite, DAC with Pt pressure marker

Source

Paper
Equation of state of MgSiO 3 with the perovskite structure based on experimenta…
Authors
Surendra K. Saxena; Leonid Dubrovinsky; Faramarz Tutti; Tristan Le Bihan
DOI
10.2138/am-1999-0303
Year
1999
Journal
American Mineralogist
Origin
Original (measured or fitted in the source paper)

Evidence from the paper

The second model uses Equations 20 and 17. ... Table 3. Data calculated using Model 2: T=300.00, KT=260.51 GPa, V(mol)=24.45 cm3. alpha_T = 2.13 x 10^-5 + 7.57 x 10^-9 T - 1.02 T^-2 (fitted to Funamori et al. 1996).

Additional notes

alpha T Model2
alpha_T = 2.13 x 10^-5 + 7.57 x 10^-9 T - 1.02 T^-2 (Eq. 20, fitted to Funamori et al. 1996)
beta T
beta = 3.735 x 10^-7 + 3.27 x 10^-11 T + 6.60 x 10^-15 T^2 (Eq. 17, data of Fiquet et al. 1998)
Ks 300K Table3
260.81 GPa
gamma th 300K Table3
0.99
alpha 300K Table3
1.22 x 10^-6/K units column labeled 10^-6/K (Table 3)