Bridgmanite
MgSiO3 (x = 0)
unknown · Original · 1991
V₀
—
Unknown basis
K₀
—
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
- 300 K
- Pref
- —
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)energy-dispersive synchrotron x-ray diffraction, cubic-anvil large-volume press, NaCl pressure medium/calibrant, P_max 7.3 GPa
- Sample
- polycrystalline pellet embedded in NaCl, synthesized at 26 GPa and 2273 K (USSA-2000)
Source
- Paper
- Phase Transition and Thermal Expansion of MgSiO 3 Perovskite
- Authors
- Yanbin Wang; Donald J. Weidner; Robert C. Liebermann; Xing Liu; Jaidong Ko; Michael T. Vaughan; Yusheng Zhao; Amir Yeganeh‐Haeri; Rosemary E. G. Pacalo
- DOI
- 10.1126/science.251.4992.410
- Year
- 1991
- Journal
- Science
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
Table 1. Zero-pressure linear compressibilities of (Mg,Fe)SiO3 perovskite at 300 K. ... 1.29 | 1.03 | 1.31 | 7.3 | 0 | NaCl | P | This study. At 300 K, the Pbnm distortion increased with pressure to 7.3 GPa ... The general trend of the cell-edge compressibilities (beta) beta_c >= beta_a > beta_b is consistent in most of these studies.
Additional notes
beta a
1.29 TPa^-1
beta b
1.03 TPa^-1
beta c
1.31 TPa^-1
P max
7.3 GPa
pressure medium
NaCl
sample form
powder
note
No V0, K0, or K' reported for this study's compression data; only zero-pressure linear compressibilities at 300 K
thermal expansivity at 7.3GPa
alpha_v = 1.44 x 10^-5 K^-1 below 623 K and 1.55 x 10^-5 K^-1 above 623 K