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Progress in Earth and Planetary Science
Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

From: Significance of the high-pressure properties and structural evolution of gas hydrates for inferring the interior of icy bodies

Fig. 2

Progression of the phase change from MH-I to MH-II as described by changes in the host structure and vibrational modes of the guest over time. a Time-resolved XRD patterns and b relative intensity of the representative diffraction lines of MH-I and MH-II. c Time-resolved Raman spectra of vibration modes and d (top) Raman shift and (bottom) fraction of methane molecules in each cage in MH-I and MH-II. The 12-hedra in MH-I are preserved in the following MH-II structure, and the 14-hedra of MH-I are recombined into 12-hedra, modified 12-hedra, and 20-hedra in MH-II. This figure is modified from Hirai et al. (2015)

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