Superhydrous phase B

Mg8.93Si2.72Al0.56O18H5.57

finite strain (unspecified form) · Original · 2024

Why this differs from similar rows?

Room-temperature-only fit over 11.4-21.1 GPa/300 K; sibling row is instead a global fit including higher-temperature data (11.4-23.5 GPa/300-900 K), which adds a dK/dT term and changes K0/K'.

V₀

621.41

Å³

Unit cell

K₀

148

GPa

Adiabatic

K′

4.300

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
621.41	Å³	Unit cell	—

Reported value and unit are preserved as extracted. Z (formula units per cell) is not stored yet, so molar ↔ Å³/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

T_ref: 300 K
P_ref: —
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), room-T 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, 11.4–21.1 GPa/300 K, V0 = 621.41a, KS0 = 148 (3), K' = 4.3 (3), G0 = 94 (2), ∂G/∂P = 1.8 (8). 'The zero-pressure adiabatic bulk and shear moduli, KS0 and G0, and their pressure and temperature derivatives, K' and G' were constrained by fitting our room T velocity and density data to functions of Eulerian finite strain EoS.'

Additional notes

G0 GPa

94 (2)

dG dP

1.8 (8)

P T conditions

11.4–21.1 GPa / 300 K

V0 fixed in fit

True