A preliminary investigation of two solid phases of deuterated ammonia has been performed by singlehyphen;crystal neutron diffraction. At 5.1 kbar and 240 K, the newly discovered solid II was found to consist of orientationally disordered molecules in a hexagonal closehyphen;packed lattice with space groundP63/mmcand lattice constantsa=3.588(2) Aring; andc=5.870(2) Aring;. The primitive cubic structure (space groupP213) of solid I was confirmed up to a pressure of 5.1 kbar at 215 K, where the lattice constant is 5.035(2) Aring;.
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