Bridgmanite
CaTiO3
third-order Birch-Murnaghan · Original · 1999
V₀
223.764
ų
Unit cell
K₀
170.900
GPa
Isothermal
K′
6.600
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| 223.764 | 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 |
|---|---|
| CaO | 1 |
| TiO2 | 1 |
Formula: CaTiO3
Conditions & method
- Tref
- —
- Pref
- 0.001 GPa
- Structure
- orthorhombic perovskite (Pbnm/Pnma)
- Method
- experiment (XRD / DAC / multianvil compression)high-pressure single-crystal X-ray diffraction (diamond-anvil cell, quartz internal pressure standard), weighted-least-squares fit to P-V data
- Sample
- single crystal provided by E. Takayama-Muromachi (NIRIM, Tsukuba, Japan)
Source
- Paper
- Compression of CaTiO 3 and CaGeO 3 perovskites
- Authors
- Nancy L. Ross; R. J. Angel
- DOI
- 10.2138/am-1999-0309
- Year
- 1999
- Journal
- American Mineralogist
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
CaTiO3 reveals V0 = 223.764 ± 0.017 ų, K_T.0 = 170.9 ± 1.4 GPa, and K' = 6.6 ± 0.3 with a χ²w = 1.4 and ΔPmax = |Pobs − Pcalc|max = 0.03 GPa. ... Fitting a third-order Birch-Murnaghan equation-of-state to the P-V data yields values of V0 223.764 ± 0.017 ų, K_T,0 = 170.9 ± 1.4 GPa, and K' = ∂K/∂P = 6.6 ± 0.3 for CaTiO3.
Additional notes
P max GPa
9.7
measured ambient unit cell volume
223.769(17) ų at 0.001 GPa (Table 1)
chi2 w
1.4
delta P max
0.03 GPa
axial moduli
Ka = 168.7 ± 2.1 GPa (K'a = 5.7 ± 0.5), Kb = 168.3 ± 1.9 GPa (K'b = 7.0 ± 0.4), Kc = 175.3 ± 1.5 GPa (K'c = 6.6 ± 0.3), from linear Murnaghan EoS fits to axes
comparison ultrasonic Ks
177 ± 3 GPa (Liebermann et al. 1977), 177 ± 3 GPa (Fischer et al. 1993), 175 ± 1 GPa (Sinelnikov et al. 1998), 175 GPa (Kung and Rigden 1998)
lower mantle relevance
analogue framed in context of lower-mantle silicate perovskites MgSiO3 and CaSiO3