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Post-stishovite (CaCl₂-type)
SiO2
third-order Birch-Murnaghan · Original · 2019
Why this differs from similar rows?
Table 2 Model 1 with q fixed to 0.8; sibling rows use different fixed q values (1 in Table 1/Model 2, 1.2 in Model 3), which change the fitted K_T0.
V₀
48.1
ų
Unit cell
K₀
244
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 48.1 | ų | Unit cell | — |
Reported value and unit are preserved as extracted. Z (formula units per cell) is not stored yet, so molar ↔ ų/f.u. conversion is not applied automatically.
Composition
| Oxide | Molar |
|---|---|
| SiO2 | 1 |
Formula: SiO2
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- CaCl2-type SiO2
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron XRD in laser-heated diamond anvil cell
- Sample
- This study, Table 2 Model 1 (q = 0.8 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), CaCl2-type phase Model 1: K_0T (GPa) 244 (7); K_0T' 4 (fixed); V0 (Å3) 48.1 (3); θ_D0 (K) 1000 (400); γ0 1.2 (2); q 0.8 (fixed)
Additional notes
theta D0 K
1000 (400)
gamma 0
1.2 (2)
q
0.8 (fixed)