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 2, 'HT-BM3') with only V0 fixed to 97.76 A3, letting K0 and K' vary in the joint fit; other rows fix additional/different parameters.
V₀
97.76
ų
Unit cell
K₀
146
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 2 (HT-BM3, only V0 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 further fit the P-V-T data with a fixed V0 to 97.76 Å3 alone, yielding KT0, K'0, a0, a1, and (∂KT/∂T)P... Table 2: V0 = 97.76e, KT0 = 146(5), K'0 = 3.4(2), dKT/dT = -0.022(8), a0 = 4.4(5), a1 = 0.9(8).
Additional notes
dKT dT
-0.022(8) GPa×K-1
a0
4.4(5) ×10-5 K-1
a1
0.9(8) ×10-8 K-2