Bridgmanite
(Fe2+_0.64(2)Fe3+_0.24(2))Si_1.00(3)O3
Birch-Murnaghan (order unspecified) · Original · 2016
V₀
178.98
ų
Unit cell
K₀
190
GPa
Isothermal
K′
4
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 178.98 | 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 |
|---|---|
| FeO | 0.64 |
| Fe2O3 | 0.12 |
| SiO2 | 1 |
Formula: (Fe2+_0.64(2)Fe3+_0.24(2))Si_1.00(3)O3
Conditions & method
- Tref
- 300 K
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)single-crystal X-ray diffraction in laser-heated diamond anvil cell (synchrotron SCXRD)
- Sample
- single crystals of pure iron bridgmanite synthesized in laser-heated DAC from skiagite-majorite garnet
Source
- Paper
- Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pur…
- Authors
- Leyla Ismailova; Elena Bykova; Maxim Bykov; Valerio Cerantola; Catherine McCammon; Tiziana Boffa Ballaran; Andrei Bobrov; Ryosuke Sinmyo; Natalia Dubrovinskaia; Konstantin Glazyrin; Hanns‐Peter Liermann; Ilya Kupenko; Michael Hanfland; Clemens Prescher; Vitali B. Prakapenka; Volodymyr Svitlyk; Leonid Dubrovinsky
- DOI
- 10.1126/sciadv.1600427
- Year
- 2016
- Journal
- Science Advances
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
The data are fitted (solid dark red line) with a Birch-Murnaghan equation of state, giving bulk modulus of K300 = 190(4) GPa and unit cell volume at ambient conditions V0 = 178.98(6) Å (K' = 4). ... it has a bulk modulus of K300 = 190(4) GPa [K' = 4, V0 = 178.98(6) Å3 per unit cell; Fig. 3 and table S3]
Additional notes
high pressure values this study
at 80 GPa: rho_80 = 5.99(1) g/cm3 and K_80,300 = 480(15) GPa
vacancies
significant amount of vacancies (~12%) at the A-site via substitution 3Fe2+ -> 2Fe3+ + vacancy; all iron located in A-site
pressure medium
Ne (quasi-hydrostatic), Ne EOS used as pressure standard
data range
structure maintained on compression up to ~125 GPa and decompression down to at least 13 GPa