Investigation of the FexOy - H2O - CO2 system at high P - T

Condensed Matter lunchtime seminar

Investigation of the FexOy - H2O - CO2 system at high P - T

  • Event time: 1:00pm
  • Event date: 28th November 2011
  • Speaker: Donna Marie Morton (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

Mineral storage of carbon dioxide (CO2) in the form of geologically stable carbonates has been studied to help combat rising levels of CO2 in the atmosphere. Fe-bearing carbonate formation from FexOy + CO2 + H2O solutions under high pressures and temperatures has been studied experimentally using diamond-anvil cell techniques combined with laser heating. The reaction process has been studied at pressures in the range of 2 GPa up to 10 GPa and temperatures up to ~1500 K. Various forms of iron oxide have been loaded into diamond anvil cells and measured, including Fe2O3, Fe3O4 and siderite (FeCO3). All of these samples exhibited a clear CO2 Raman signal before laser heating, and, in many, a significantly reduced signal afterwards. Control samples have also been studied to establish that this is not a laser heating phenomena exhibited in carbon dioxide. In this range of high pressures and temperatures the carbon dioxide reacts with the various samples of oxidised iron studied to form iron carbonates. The carbonate formation was determined by in-situ Raman spectroscopy and further characterised by synchrotron x-ray diffraction.

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

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