post-aragonite CaCO3-Pmmn
CaCO3
third-order Birch-Murnaghan · Original · 2020
Why this differs from similar rows?
This study's 300 K fit referenced to 50 GPa rather than zero pressure (K50, K'50, V50); not zero-pressure parameters, unlike the other rows in this group.
V₀
77.526
ų
Unit cell
K₀
302
GPa
Isothermal
K′
2.100
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 77.526 | 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
- 50 GPa
- Structure
- other / unspecified
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron XRD in laser-heated diamond-anvil cell (PM: Ne), Au pressure scale (Fei et al. 2007)
- Sample
- This study, 300 K fit with reference pressure set at 50 GPa
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 therefore also fit our 300 K data setting 50 GPa as the reference pressure and obtain K50 = 302(±15) GPa, K'50 = 2.1(±1.7), and V50 = 77.526(±0.046) Å3.
Additional notes
note
Parameters referenced to 50 GPa, not zero pressure