Stishovite

SiO2

Vinet · Original · 2012

V₀

46.55

Å³

Unit cell

K₀

292

GPa

Isothermal

K′

5.010

dimensionless

Volume (V₀)

Value	Unit	Basis	Z
46.55	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
SiO2	1

Formula: SiO2

Conditions & method

T_ref: 300 K
P_ref: —
Structure: rutile-type (stishovite)
Method: experiment (XRD / DAC / multianvil compression)
in situ P-V-T synchrotron XRD in sintered-diamond Kawai-type multianvil apparatus (SPEED-MK.II, BL04B1 SPring-8), 17-54 GPa, 300-1700 K, Au pressure scale (Tsuchiya 2003)
Sample: synthesized from high-purity alpha-quartz powder mixed with 5 wt % Au pressure marker

Source

Paper: P‐V‐T equation of state of stishovite up to mid‐lower mantle conditions
Authors: Fulong Wang; Yoshinori Tange; Tetsuo Irifune; Ken‐ichi Funakoshi
DOI: 10.1029/2011jb009100
Year: 2012
Journal: Journal of Geophysical Research Atmospheres
Origin: Original (measured or fitted in the source paper)

Evidence from the paper

Table 2. EOS Parameters of Stishovite: Morse-Rydberg (Vinet): V0 (Å3) 46.55a, K_T0 (GPa) 292(2), K'_T0 5.01(12), Θ0(K) 1130(110), γ0 1.67(7), a 1a, b 3.0(4); aFixed in EOS analyses. 'five model parameters, K_T0, K'_T0, Θ0, γ0, and b, were determined with fixed V0 of 46.55 Å3 determined at ambient conditions in this study'. 'The unit cell volume of recovered stishovite was 46.553(19) Å3 at ambient conditions'.

Additional notes

Theta 0 K

1130(110)

gamma 0

1.67(7)

a parameter

1 (fixed)

b parameter

3.0(4)

V0 fixed in fit

V0 fixed at 46.55 Å3 in EOS analyses, determined at ambient conditions in this study (recovered sample: 46.553(19) Å3)

K S0 derived

K_S0 = 294 GPa (Morse-Rydberg) with uncertainty ±2 GPa

alpha 0

1.644 (±0.23) × 10^-5 /K

C P0

40.5 (±6) J/K·mol