Figure 3
The experiment was conducted in a moissanite anvil cell. The solid copper acetate (Cu(Ac)2), quartz (Qz) and copper acetate solution (7%) were enclosed in the hole of a thin rhenium metal gasket (a) With the increment of temperature and pressure, the solid copper acetate dissolved to form blue solution. (b) At 212 °C/ 511 MPa, black grains appeared (c), which were identified to be native copper under microscope (f). When the temperature reduced to 15 °C, the vapour bubble appeared (d), which was proven to be CO2 by Laser Raman (e). Unfortunately, we failed to get the pressure at 15 °C due to coating of native copper on the quartz grain.
