Phase D
20.7 wt% MgO, 44.5 wt% SiO2, 18.8 wt% Al2O3, ~16.0 wt% H2O (EDS)
finite strain (unspecified form) · Original · 2020
Why this differs from similar rows?
Table 1 finite strain fit over 0-23 GPa/300-900 K with K' fitted freely (=5.55) while K0 stays fixed; sibling rows either fix K' too or let both K0 and K' float.
V₀
86.71
ų
Unit cell
K₀
144
GPa
Adiabatic
K′
5.550
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 86.71 | 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 | 1.386912 |
| Al2O3 | 0.497913 |
| SiO2 | 2 |
| H2O | 2.398336 |
Formula: 20.7 wt% MgO, 44.5 wt% SiO2, 18.8 wt% Al2O3, ~16.0 wt% H2O (EDS)
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (Brillouin / ultrasonic / elasticity)ultrasonic velocity and density measurements, pressure-scale-free fit (Li & Liebermann, 2014)
- Sample
- Al-PhD, Table 1, finite strain EoS, 0-23 GPa/300-900 K (row with K' fitted, K0 fixed)
Source
- Paper
- Sound Velocities of Al‐Bearing Phase D up to 22 GPa and 1300 K
- Authors
- Chaowen Xu; Steeve Gréaux; Toru Inoue; Masamichi Noda; Wei Sun; H. Kuwahara; Yuji Higo
- DOI
- 10.1029/2020gl088877
- Year
- 2020
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Table 1: Al-PhD, 0-23 GPa/300-900 K, V0 = 86.71a, K = 144a, K' = 5.55 (7), ∂K/∂T = -0.024(1), G0 = 106a, ∂G/∂P = 2.45 (4), ∂G/∂T = -0.032(2), a = 3.5a, b = 0.9a
Additional notes
P T range
0-23 GPa/300-900 K
dK dT
-0.024(1) GPa K^-1
G0
106 GPa (fixed)
dG dP
2.45 (4)
dG dT
-0.032(2) GPa K^-1