Akimotoite
MgSiO3 (enstatite end member)
Murnaghan · Original · 2007
V₀
—
Unknown basis
K₀
255
GPa
Adiabatic
K′
—
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
- —
- Pref
- —
- Structure
- ilmenite (akimotoite)
- Method
- experiment (shock wave)shock-wave Hugoniot data reduced to isentrope
- Sample
- linear fit to (Mg,Fe)SiO3 'solid solution series' shock-wave data, MgSiO3 end member
Source
- Paper
- On the Occurrence of (Mg, Fe)SiO3 in the Lower Mantle
- Authors
- E. K. Graham
- DOI
- 10.1111/j.1365-246x.1975.tb06463.x
- Year
- 2007
- Journal
- Geophysical Journal of the Royal Astronomical Society
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
A linear fit to these 'solid solution series' data yields the following results for the high pressure phase MgSiO3 and FeSiO3 end members, respectively: rho0 = 3.74 g cm-3 and K0 = 2.55 Mbar; ... K^S(MgSiO3) = 2.55 Mb ... the estimated uncertainty in these values is 10 per cent.
Additional notes
rho0
3.74 g cm-3
K0 uncertainty
10 per cent
note
Zero-pressure isentropic bulk modulus of shock-induced high-pressure phase inferred to be ilmenite/corundum structured; framed as lower-mantle relevant. No V0 reported (density rho0 given instead).
Kp context
values of (dK^S/dP)_0 on the order of 2 were required to fit the high-pressure shock-wave data for all rocks