Fig. 1
From: Topologically frustrated ionisation in a water-ammonia ice mixture
Phase diagram and structures of AMH. a Phase diagram of AMH. b Representation of the \(Im\overline 3 m\) structure of the DMA phase VI26. The oxygen and nitrogen atoms are represented with the blue and red spheres, respectively. The water and ammonia molecules occupy the same sites with a 50% probability. The white spheres show the 16 possible positions along the \(\left\langle {111} \right\rangle \) direction for the five hydrogen atoms in the unit cell. The other possible sites for H atoms along \(\left\langle {110} \right\rangle \) are less probable and not represented for clarity. c Representation of the predicted ionic P4/nmm structure according to ref. 33. The same colour code is adopted for the atoms
