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The crystal structure of the tetragonal phase, V, of NH 4 NO 3  at –150°C has been determined by x-ray methods, by cooling single crystals of the room temperature phase. The axes transformations are: [001] IV –[001] v ; [100] IV  and [010] IV –[l[unk]O] v . The lattice constants are  a  = 7.98 Å,  c  = 9,78 Å. The space group is  P 4 2  and  Z  = 8. The structure has been solved from the Fourier projections(001)and (1[unk]0). The final values of the discrepancy factor are  R   hk 0  = 0.15 and  R hhl   = 0.18.

The crystal structure of the low-temperature phase of NH 4 NO 3 (V) at−150°C*