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Superhydrous phase B
Mg8.93Si2.72Al0.56O18H5.57
finite strain (unspecified form) · Original · 2024
Why this differs from similar rows?
Global high-P-T fit over 11.4-23.5 GPa/300-900 K including a dK/dT term; sibling row is the room-temperature-only fit (11.4-21.1 GPa/300 K).
V₀
621.41
ų
Unit cell
K₀
147
GPa
Adiabatic
K′
4.400
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 621.41 | 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 | 8.93 |
| Al2O3 | 0.28 |
| SiO2 | 2.72 |
| H2O | 2.785 |
Formula: Mg8.93Si2.72Al0.56O18H5.57
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (Brillouin / ultrasonic / elasticity)ultrasonic interferometry (VP, VS) + synchrotron X-ray diffraction density in Kawai-type multi-anvil apparatus
- Sample
- S3358 (polycrystalline), high P-T global fit
Source
- Paper
- Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at H…
- Authors
- Chaowen Xu; Steeve Gréaux; Ying Chun Li; Fengxia Sun; Jing Gao; Fei Qin; Toru Inoue
- DOI
- 10.1029/2023gl107818
- Year
- 2024
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Table 1 (Finite strain EoS, P-scale free): S3358, 11.4–23.5 GPa/300–900 K, V0 = 621.41a, 147 (2), 4.4 (1), ∂KS/∂T = −0.017 (1), G0 = 93.9 (9), ∂G/∂P = 1.8 (3), ∂G/∂T = −0.019 (1), α0 = 4.3a.
Additional notes
dKS dT GPa per K
−0.017 (1)
G0 GPa
93.9 (9)
dG dP
1.8 (3)
dG dT GPa per K
−0.019 (1)
alpha0 1e-5 per K
4.3 (fixed)
P T conditions
11.4–23.5 GPa / 300–900 K
V0 fixed in fit
True