Ferropericlase

(Mg,Fe)O in KLB-1 peridotite, ~15 atom% iron; data reproduced by EoS of (Mg0.80,Fe0.20)O

Birch-Murnaghan (order unspecified) · Original · 2009

Why this differs from similar rows?

Low-spin (LS) ferropericlase state, K0 fixed to 170 GPa from Fei et al. [2007b] (K' fixed to 4); sibling row is the high-spin (HS) state with a different fixed K0.

V₀

74.04

Å³

Unit cell

K₀

170

GPa

Isothermal

K′

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
74.04	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	0.8
FeO	0.2

Formula: (Mg,Fe)O in KLB-1 peridotite, ~15 atom% iron; data reproduced by EoS of (Mg0.80,Fe0.20)O

Conditions & method

T_ref: —
P_ref: —
Structure: —
Method: experiment (XRD / DAC / multianvil compression)
synchrotron X-ray diffraction in laser-heated diamond anvil cell (room-temperature P-V fit for spin states)
Sample: KLB-1 peridotite sintered with 7 wt% gold, Table 1 column Fp LS

Source

Paper: Density profile of pyrolite under the lower mantle conditions
Authors: A. Ricolleau; Yingwei Fei; Elizabeth Cottrell; H. C. Watson; Liwei Deng; Li Zhang; G. Fiquet; Anne‐Line Auzende; Mathieu Roskosz; G. Morard; Vitali B. Prakapenka
DOI: 10.1029/2008gl036759
Year: 2009
Journal: Geophysical Research Letters
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

"We fit our pressure-volume data at room temperature by fixing the high-spin and low-spin bulk modulus, equal to 158 GPa and 170 GPa respectively [Fei et al., 2007b] (with fixed K' = 4), and obtained V0 for each spin state condition (Table 1)." Table 1: Fp LS V0 (Å3) 74.04 (2); K0,T (GPa) 170 (fixed); K'0,T 4 (fixed).

Additional notes

K0 source

fixed to value from Fei et al. [2007b]

notes

Low-spin state observed above ~50 GPa along room-temperature compression; no thermal parameters listed for LS in Table 1