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The crystal structure of the hydroxylammonium aluminium sulfate dodecahydrate alum, (NH 3 OH)Al(SO 4 ) 2  · 12H 2 O, has been determined from three dimensional neutron diffraction data. The compound crystallizes cubic with  a  - 12.328(4) Å in the space group Pa3. The (NH 3 OH)  +  complex around ½½½, the centre of symmetry, is arranged with equal probability over two orientations related to each other by a centre of symmetry. The elastic diffraction experiment gives a space and time-average picture of two orientations obtained by a rotation of the (NH 3 OH) +  complex around an axis perpendicular to the N − O bond. The positional and thermal parameters have been refined by full-matrix least-squares analysis to a weighted  R -value of 1.9%. Disorder in the (SO 4 ) 2−  complex has been considered and only 3% disorder has been found.

zeitschrift für kristallographie - crystalline materials

Neutron diffraction study of alums L The crystal structure of hydroxylammonium aluminium alum L The crystal structure of hydroxylammonium aluminium alum