Bridgmanite

MgSiO3 with 5 mol% Al2O3

third-order Birch-Murnaghan · Original · 1999

Why this differs from similar rows?

Table 3, Run 3 of the in situ P-V-T XRD experiment; ambient V0 fixed to the measured Run 3 unit-cell volume (163.220 A3), distinct from Runs 1 and 2.

V₀

163.22

Å³

Unit cell

K₀

236

GPa

Isothermal

K′

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
163.22	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: experiment (XRD / DAC / multianvil compression)
in situ P-V-T X-ray diffraction (multi-anvil press, NaCl medium)
Sample: Al-Pv, Run 3

Source

Paper: Thermal Equation of State of Aluminum-Enriched Silicate Perovskite
Authors: Jianzhong Zhang; Donald J. Weidner
DOI: 10.1126/science.284.5415.782
Year: 1999
Journal: Science
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Table 3: Al-Pv Run 3: K_{0,T} = 236(2) GPa; 'In all studies, the pressure derivative, K_0', is fixed at 4. Ambient unit-cell volume, V_0, was fixed in the data reduction of this study.' Table 1, Run 3 (beginning of run): V = 163.220(93) Å³.

Additional notes

dKT dT GPa per K HT BM

-0.064(7)

dKT dT GPa per K isothermal PV

-0.062(4)

alpha0 x1e5

2.16(17)

alpha1 x1e8

1.87(42)

beta a x1e3 GPa-1

1.36(2)

beta b x1e3 GPa-1

1.19(3)

beta c x1e3 GPa-1

1.45(2)

V0 note

Table 1 also lists end-of-run volume 163.275(71) Å³ for Run 3