The detailed crystal structure of ammonia monohydrate phase VI---stable above 6.5 GPa at 300 K---has been determined from neutron diffraction data. It has a body-centered cubic arrangement of molecular centers that are randomly occupied by water or ammonia molecules. The hydrogen-atom positions suggest that the structure is hydrogen bonded and the phase thus appears to be an H-bonded molecular alloy. This type of structure may accommodate nonstoichiometry and be stable to very high pressures.
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Loveday et al. (1999) studied this question.
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