Neutron diffraction study of alums L The crystal structure of hydroxylammonium aluminium alum L The crystal structure of hydroxylammonium aluminium alum
Abstract
The crystal structure of the hydroxylammonium aluminium sulfate dodecahydrate alum, (NH3OH)Al(SO4)2 · 12H2O, 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 (NH3OH) + 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 (NH3OH)+ 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 (SO4)2− complex has been considered and only 3% disorder has been found.
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Articles in the same Issue
- Die Kristallstruktur von synthetischem Ammoniumtetraboratdihydrat, (NH4)2[B4O5(OH)4]·2H2O
- Structures of three crystals containing approximately — linear chains of triiodide ions
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- Structure cristalline de l'octamolybdate de 3-ethyl pyridinium ápolyanions discrets [MO8O26]4−
- The structure of hydrohematite
- Verfeinerung der Kristallstrukturen von Li2SiO3 und Li2GeO3
- Crystal and molecular structures of (l)acetatobis(acetone S-methylthiosemicarbazone)cobalt(II) iodide and (2)acetato-bis(acetone S-methylthiosemicarbazone) nickel(II) iodide*
- The frameworks of sodalite-like structures and of tetrahedrite-like structures1
- Crystal structure of beryllium polyphosphate BeP2O6 III – a derivative of silica K (keatite)
- Optical, electrooptical and piezoelectric constants of d( + )-camphoric acid acetone
- Beobachtung einer Wachstumsinstabilität durch Kathodolumineszenz
- The crystal structures of yttrium, holmium and erbium formate dihydrates*
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