NON-MOLECULAR CARBON DIOXIDE AT HIGH PRESSURE

A brief review on the high pressure, non-molecular phases of CO2, which have been all discovered along the present decade, will be presented. It includes references to experimental studies, based on the XRD and optical spectroscopy techniques coupled to the diamond anvil cell (DAC), and to ab initio simulation studies. The matter is still under strong debate, and many open issues are left on the high pressure-high temperature phase diagram of this important substance.