Periclase

MgO

Stacey reciprocal K-primed · Original · 2025

V₀

74.698

Å³/cell

Unit cell

K₀

160.600

GPa

Isothermal

K′

4.227

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
74.698	Å³/cell	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: —
P_ref: —
Structure: B1 rocksalt (Fm-3m)
Method: experiment (XRD / DAC / multianvil compression)
static compression, synchrotron XRD (SPring-8 BL10XU/BL37XU), laser-heated DAC, calibrated against Cu pressure scale
Sample: MgO + Pt, runs #7a, #7b, #7c (LHDAC, laser-annealed up to ~2000 K, W gasket)

Source

Paper: The equations of state of nine materials up to 0.43 TPa for extreme pressure sc…
Authors: Takeshi Sakai; Hirokazu Kadobayashi; Yuki Nakamoto; Haruhiko Dekura; Naoki Ishimatsu; Saori I. Kawaguchi; Yusuke Seto; Oki Sekizawa; Kiyofumi Nitta; Katsuya Shimizu
DOI: 10.1038/s43246-025-00792-5
Year: 2025
Journal: Communications Materials
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Table 2 | Rydberg-Stacey equation of state (R-S EoS) parameters calibrated by Cu-scale: MgO V0 = 74.698 Å³/unit cell (fix, Ref. 37 and references therein), K0 = 160.6 GPa (fix, Ref. 37), K'0 = 4.227 ±0.009, K'∞ = 5/3 (fix). 'During the fitting process, the zero-pressure volume (V0) and bulk modulus (K0) were fixed to the values in literatures except for high pressure phases (NaCl-B2 and Fe-hcp), and K'∞ was fixed to 5/3 (Table 2).'

Additional notes

K prime infinity

5/3 (fixed)

V0 K0 source

Ref. 37 and references therein (fixed literature values)

max pressure

runs #7a/#7b/#7c reached 314, 144, 55 GPa respectively (Table 1)

pressure calibrant

Pt, ultimately tied to Cu primary scale (ref. 21) via calibration path in Fig. 1

note

Volume of MgO determined using 2-3 XRD peaks; internally consistent EoS set of 9 materials up to ~430 GPa