Phase D
20.7 wt% MgO, 44.5 wt% SiO2, 18.8 wt% Al2O3, ~16.0 wt% H2O (EDS)
third-order Birch-Murnaghan · Original · 2020
V₀
86.71
ų
Unit cell
K₀
143
GPa
Isothermal
K′
5.800
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 | 0.8968 |
| Al2O3 | 0.322 |
| SiO2 | 1.2932 |
| H2O | 1.5508 |
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)in situ synchrotron X-ray diffraction with ultrasonic measurements in Kawai-type multianvil apparatus (Gold P-scale, Tsuchiya, 2003)
- Sample
- polycrystalline Al-bearing phase D synthesized at 24 GPa and 1373 K
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
Room-temperature data of Al-bearing phase D obtained up to 20.5 GPa were fitted to a third-order Birch–Murnaghan equation of state using least-squares fitting with the EosFit program (Angel, 2001), which yielded V0 = 86.71 Å3 (fixed), K_T0 = 143 (5) GPa, and K_T0' = 5.8 (7).
Additional notes
P range
0-21 GPa (data to 20.5 GPa)
note
V0 fixed to XRD value at room P-T; Table 1 lists this fit as K_T0 = 143 (4) GPa, 5.8 (7); ambient lattice parameters a = 4.8077(4) Å, c = 4.3218(6) Å, V = 86.51(1) Å3