Figure 3 | Scientific Reports

Figure 3

From: Diamond and methane formation from the chemical decomposition of polyethylene at high pressures and temperatures

Figure 3The alternative text for this image may have been generated using AI.

(A) Methane XRD patterns as a function of pressure. Red lines correspond to decomposition at 11.5 GPa and blue lines to decomposition at 29.0 GPa. From 7.3 to 20.7 GPa multiple peaks were indexed to methane’s rhombohedral phase A. At 29.0 GPa a single peak was observed consistent with the simple cubic HP methane phase. (B) Methane molecular volume, obtained from XRD peak positions, as a function of pressure. Methane A and cubic methane equations of state are shown in purple and yellow respectively, with the width of the curve representing uncertainty23. The solid line is the best fitting EOS to the methane A data shown here (P < 25 GPa).

Back to article page