Fe-dolomite-III (low spin)
Ca0.988Mg0.918Fe0.078Mn0.016(CO3)2
third-order Birch-Murnaghan · Original · 2011
V₀
231.8
ų
Unit cell
K₀
184
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 231.8 | 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 |
|---|---|
| MgO | 0.918 |
| FeO | 0.078 |
| CaO | 0.988 |
| MnO | 0.016 |
| CO2 | 2 |
Formula: Ca0.988Mg0.918Fe0.078Mn0.016(C2O6)
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron X-ray diffraction in laser-heated diamond anvil cell
- Sample
- natural Fe-dolomite from Windham, Vermont (mixed with 5 wt.% Pt)
Source
- Paper
- Dolomite III: A new candidate lower mantle carbonate
- Authors
- Zhu Mao; Matt M. Armentrout; Emma S. G. Rainey; C. E. Manning; Przemysław Dera; Vitali B. Prakapenka; A. Kavner
- DOI
- 10.1029/2011gl049519
- Year
- 2011
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
For low spin phase III, We obtained K_0 = 184(±4) GPa, V_0 = 231.8(±0.7) ų with K_0' = 4 (fixed).
Additional notes
stability range
stable between 36 and 83 GPa up to 1500 K; framed as candidate lower mantle carbonate
spin transition
~2% volume drop at ~47 GPa during decompression interpreted as pressure-induced spin transition
uncertainty note
Strong tradeoffs between K0 and K0' (varying K0' by ±0.5 produces up to 15% change in K0 and 1.3% in V0); V0 for phase III is unknown, generating large uncertainties