Bridgmanite
MgSiO3
third-order Birch-Murnaghan · Original · 2009
Why this differs from similar rows?
Primary free fit to P-V-T XRD data (19-53 GPa, 300-2300 K) yielding both K_T0 and K'_T0; sibling row instead fixes K_T0 to 253 GPa and refits only K'_T0.
V₀
—
Unknown basis
K₀
256
GPa
Isothermal
K′
3.800
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| — | — | Unknown basis | — |
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 |
| SiO2 | 1 |
Formula: MgSiO3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)in situ energy-dispersive X-ray diffraction in Kawai-type multi-anvil apparatus (WC and SD anvils), SPring-8 BL04B1
- Sample
- MgSiO3 perovskite synthesized in situ from enstatite/forsterite+MgO starting materials
Source
- Paper
- P‐V‐T relations of MgSiO3 perovskite determined by in situ X‐ray diffraction us…
- Authors
- Tomoo Katsura; Sho Yokoshi; Kazuaki Kawabe; Anton Shatskiy; Geeth Manthilake; Shuangmeng Zhai; Hiroshi Fukui; H. A. Chamathni I. Hegoda; Takashi Yoshino; Daisuke Yamazaki; Takuya Matsuzaki; Akira Yoneda; Eiji Ito; Mitsuhiro Sugita; Naotaka Tomioka; Kenji Hagiya; Akifumi Nozawa; Ken‐ichi Funakoshi
- DOI
- 10.1029/2008gl035658
- Year
- 2009
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
The obtained volume data at high pressure and ambient temperature, V_P,0, were fitted to the third-order Birch-Murnaghan equation of state ... We obtained K_T0 = 256(2) GPa and K'_T0 = 3.8(2).
Additional notes
ambient cell parameters
a0 = 4.7769(2), b0 = 4.9298(2), c0 = 6.8956(3) Å
theta0
1030 K (fixed, from Akaogi and Ito [1993])
gamma0
2.6(1)
q
1.7(1)
dKT dT P
-0.035(2) GPa/K (high-temperature Birch-Murnaghan fit)
delta T
6.5(5)
alpha0
2.6(1)x10^-5 + 1.0(1)x10^-8 (T - 300)/K
pressure range
19 to 53 GPa
temperature range
300 to 2300 K
pressure scales
MgO scales of Matsui et al. [2000] and Speziale et al. [2001]
thermal eos
Mie-Grüneisen-Debye equation of state used for P-V-T fitting