Figure 2
From: Diamond formation from methane hydrate under the internal conditions of giant icy planets
Typical Raman spectra of the sample before and after heating at approximately 3050 K and 19 GPa for 10 min. Each Raman spectrum (I–III) was obtained from each measurement point (I–III) indicated by the arrows in Fig. 1a. (a) Formation of solid methane (phase B; purple triangles) and other heavier hydrocarbons (yellow triangles) via the decomposition of methane hydrate (MH-III; green circles) and polymerisation of methane. (b) Appearance of the H–H vibration mode of the hydrogen hydrate formed through the reaction between water and released hydrogen via the molecular dissociation of methane.
