Seifertite

SiO2

third-order Birch-Murnaghan · Original · 2019

Why this differs from similar rows?

Table 2 Model 3 with q fixed to 1.2; sibling rows use different fixed q values (1 in Table 1/Model 2, 0.8 in Model 1), changing the fitted K_T0.

V₀

92.3

Å³

Unit cell

K₀

291

GPa

Isothermal

K′

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
92.3	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
SiO2	1

Formula: SiO2

Conditions & method

T_ref: 300 K
P_ref: —
Structure: alpha-PbO2-type (seifertite)
Method: experiment (XRD / DAC / multianvil compression)
synchrotron XRD in laser-heated diamond anvil cell
Sample: This study, Table 2 Model 3 (q = 1.2 fixed)

Source

Paper: High Pressure‐Temperature Study on the Thermal Equations of State of Seifertite…
Authors: Ningyu Sun; Weigang Shi; Zhu Mao; Cijin Zhou; Vitali B. Prakapenka
DOI: 10.1029/2019jb017853
Year: 2019
Journal: Journal of Geophysical Research Solid Earth
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Table 2 (Thermoelastic parameters of SiO2 with varying q), Seifertite Model 3: K_0T (GPa) 291 (10); K_0T' 4 (fixed); V0 (Å3) 92.3 (4); θ_D0 (K) 1500 (200); γ0 1.7 (2); q 1.2 (fixed)

Additional notes

theta D0 K

1500 (200)

gamma 0

1.7 (2)

1.2 (fixed)