Periclase

MgO

third-order Birch-Murnaghan · Original · 2000

Why this differs from similar rows?

Fit with K0 fixed to 161 GPa (from acoustic/sound-velocity measurements), K' fitted freely to 3.94; sibling row instead fixes K'=4 and fits K0 freely (=159).

V₀

74.71

Å³

Unit cell

K₀

161

GPa

Isothermal

K′

3.940

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
74.71	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

Formula: MgO

Conditions & method

T_ref: 300 K
P_ref: —
Structure: B1 rocksalt (Fm-3m)
Method: experiment (XRD / DAC / multianvil compression)
laser-heated diamond anvil cell + monochromatic synchrotron X-ray diffraction (ESRF ID30)
Sample: high-purity synthetic MgO mixed with Pt pressure calibrant, Ar medium

Source

Paper: P‐V‐T equation of state of periclase from synchrotron radiation measurements
Authors: Agnès Dewaele; G. Fiquet; D. Andrault; Daniel M. Häusermann
DOI: 10.1029/1999jb900364
Year: 2000
Journal: Journal of Geophysical Research Atmospheres
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Table 3: Birch-Murnaghan, V0 74.71 (fixed), K0 161 (fixed), K' 3.94(5). Abstract: 'K'0 = 3.94 ± 0.2 when K0 is fixed to 161 GPa (with a Birch-Murnaghan equation of state)'. Text: 'By this method, we obtain K'0 = 3.94 ± 0.06 ... Pressure uncertainties lead to K'0 = 3.94 ± 0.2. If the present data set alone is considered, K'0 = 3.91 is obtained.'

Additional notes

K0 source

K0 fixed to acoustic-measurement value K0 = 161 ± 1 GPa (Table 1)

V0 source

V0 fixed to average of Dubrovinsky and Saxena [1997], Mao and Bell [1979], Duffy et al. [1995], Fiquet et al. [1996]: 74.71 ± 0.03 Å3

Kp this study alone

3.91

Kp with pressure uncertainties

3.94 ± 0.2

thermal parameters

α(P=0,T) = (3.0 + 0.0012T) × 10-5 K-1; (∂KT/∂T)P = -0.022(3) GPa K-1; θD0 = 800 K; γ0 = 1.45; q = 0.8 ± 0.5