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The diffraction patterns of hydrogen clathrate prepared from water at under after (a) and (b) and from ground ice-Ih (c) at , after .
Pressure-temperature phase diagram of the system in excess of hydrogen (heavy lines and symbols) plotted together with the phase diagram [thin dotted lines and Roman numerals for the stable ice phases, from (Ref. 15)]. Solid circles represent the data taken from Dyadin et al. (Ref. 5), open diamonds —- our data. The heavy dashed line is plotted based on data from Mao et al. (Ref. 9). and correspond to the fluid/liquid phases for and hydrogen solution in water, — clathrate phase, —hydrogen solution in ice framework with the structure close to ice-II (Ref. 14).
The diffraction patterns of hydrogen clathrate prepared from a chunk of ice-Ih at after (a) (b) , and (c) . Ice peaks are marked with , while all the other reflections correspond to the clathrate phase.
Synthesis time (in minutes) for clathrate prepared from ground ice-Ih and gas.
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