Pressure-induced phase transition in MnCO3 and its implications on the deep carbon cycle
- Stanford Univ., CA (United States); CNRS, Grenoble (France)
- Carnegie Inst. of Washington, Washington, DC (United States)
- Sorbonne Univ.-UPMC Univ. Paris 6, Paris (France)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
The high–pressure behavior of manganese–rich carbonate, rhodochrosite, has been characterized up to 62 GPa by synchrotron–based midinfrared spectroscopy and X–ray diffraction. Modifications in both the infrared spectra and the X–ray diffraction patterns were observed above ~35 GPa, indicating the presence of a high–pressure phase transition at these pressures. We found that rhodochrosite adopts a structure close to CaCO3–VI with a triclinic unit cell (a = 2.87 Å, b = 4.83 Å, c = 5.49 Å, α = 99.86°, β = 94.95°, and γ = 90.95° at 62 GPa). Using first–principles calculations based on density functional theory, we confirmed these observations and assigned modes in the new infrared signature of the high–pressure phase. Furthermore, these results suggest that high–pressure metastable phase of calcite may play an important role in carbon storage and transport in the deep Earth.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); COMPRES, the Consortium for Materials Properties Research in Earth Sciences; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); GENCI‐IDRIS
- Grant/Contract Number:
- SC00112704; EAR 11–57758; FC03‐03N00144; AC02‐98CH10886; AC02‐05CH11231; EAR‐1141929; 2014‐i2014041519
- OSTI ID:
- 1354492
- Report Number(s):
- BNL-113009-2016-JA
- Journal Information:
- Journal of Geophysical Research. Solid Earth, Vol. 120, Issue 6; ISSN 2169-9313
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Phase Transition and vibration properties of MnCO 3 at high pressure and high-temperature by Raman spectroscopy
|
journal | May 2018 |
Phase Transition and vibration properties of MnCO3 at high pressure and high-temperature by Raman spectroscopy
|
text | January 2018 |
Similar Records
Atomic-scale mixing between MgO and H2O in the deep interiors of water-rich planets
Pressure-induced phase transition in MnCO 3 and its implications on the deep carbon cycle: HIGH-PRESSURE PHASE TRANSITION IN MNCO 3