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Physical Review B
The high-pressure phases of solid ammonia have been investigated by x-ray diffraction in a diamond anvil cell at room temperature. Despite the first-order solid phase transition at 4 GPa, quasi-single crystals of NH 3 and ND 3 could be obtained and compressed to 123 and 62 GPa, respectively. The observed reflections above 4 GPa are compatible with the structure determined by neutron diffraction on ND 3 . We found strong evidence for an isosymmetric transition at 12 GPa in NH 3 and 18 GPa in NDdoi:10.1103/physrevb.73.174111 fatcat:ligannwpy5eg3fz6kprcfilcmq