Davemaoite
CaSiO3
Birch-Murnaghan (order unspecified) · Original · 2021
Why this differs from similar rows?
This study's free-K' fit (Table 2), K'=4.0(3) refined rather than fixed; sibling row is the fixed-K'=4 fit to the same data, giving a slightly different K0 and V0.
V₀
45.6
ų
Unit cell
K₀
227
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 45.6 | 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 |
| SiO2 | 1 |
Formula: CaSiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- hollandite / hollandite-II
- Method
- experiment (XRD / DAC / multianvil compression)synchrotron X-ray diffraction in laser-heated diamond-anvil cells
- Sample
- This study (free K' fit), Table 2
Source
- Paper
- High-pressure experimental study of tetragonal CaSiO3-perovskite to 200 GPa
- Authors
- Ningyu Sun; Hui Bian; Youyue Zhang; Jung‐Fu Lin; Vitali B. Prakapenka; Zhu Mao
- DOI
- 10.2138/am-2021-7913
- Year
- 2021
- Journal
- American Mineralogist
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Here, with a free fitting of K′, we obtained the modified V0 = 45.6(4) Å3 (Z = 1), K0T = 227(21) GPa, and K′ = 4.0(3). Table 2: This study K0T (GPa) 227(21); K' 4.0(3); V0 (Å3) 45.6(4).
Additional notes
pressure range
P-V data up to 200 GPa (24–199 GPa at 300 K, including re-analyzed Sun et al. 2016 data)
pressure scale
Pt (Fei et al. 2007)