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 4, MGD with q fixed to 1) to test the gamma0-q tradeoff; other rows fix a different set of parameters (without fixing q).
V₀
97.76
ų
Unit cell
K₀
146.700
GPa
Isothermal
K′
3.400
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 4 (MGD with q fixed to 1)
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
To investigate the tradeoff between γ0 and q, we further fix q = 1 as a common assumption, yielding γ0 = 1.53(±0.01). Table 2: V0 = 97.76e, KT0 = 146.7(19)e, K'0 = 3.4(1)e, θ0 = 631e, γ0 = 1.53(1), q = 1e.
Additional notes
theta0
631 K (fixed)
gamma0
1.53(1)
q
1 (fixed)