post-aragonite CaCO3-Pmmn
CaCO3
third-order Birch-Murnaghan · Original · 2020
Why this differs from similar rows?
This study's P-V-T fit (Table 2, row 3, MGD) with V0 and theta0 both fixed; other rows fix a different set of parameters (only V0, or additionally q=1).
V₀
97.76
ų
Unit cell
K₀
151
GPa
Isothermal
K′
3.200
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 97.76 | 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 |
|---|---|
| CaO | 1 |
| CO2 | 1 |
Formula: CaCO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron XRD with in situ laser heating (LHDAC, PM: Ne), Au pressure scale (Fei et al. 2007), up to 75 GPa and 2200 K
- Sample
- This study, P-V-T fit, Table 2 row 3 (MGD, only V0 and θ0 fixed)
Source
- Paper
- Thermal equation of state of post-aragonite CaCO3-Pmmn
- Authors
- Mingda Lv; Jiachao Liu; Eran Greenberg; Vitali B. Prakapenka; Susannah M. Dorfman
- DOI
- 10.2138/am-2020-7279
- Year
- 2020
- Journal
- American Mineralogist
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
We also fit the P-V-T data with a fixed V0 to 97.76 Å3 and θ0 to 631 K alone, yielding KT0 = 151(±4) GPa, K'0 = 3.2(±0.2), γ0 = 1.6(±0.5), and q = 1.3(±0.9).
Additional notes
theta0
631 K (fixed)
gamma0
1.6(±0.5)
q
1.3(±0.9)