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Updated: Jun 3, 2026

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Published on: October 27, 2018
Disorder of (NH4)3H(SO4)2 in the high-temperature phase I
Yoo Jung Sohn1, Karine M Sparta, Martin Meven
1RWTH Aachen University, Institut für Kristallographie, Jägerstrasse 17-19, 52056 Aachen Germany. sohn@xtal.rwth-aachen.de
Abstract:
The highly disordered crystal structure of triammonium hydrogen disulfate, (NH(4))(3)H(SO(4))(2), in the high-temperature phase I was studied using single-crystal neutron diffraction. It is known that the O atom involved in hydrogen bonding between neighbouring SO(4) tetrahedra is disordered and takes a split-atom position, building a two-dimensional hydrogen-bond network in the (001) plane. The H atoms in these SO(4)-H-SO(4) hydrogen bonds are disordered and hence refined with a split-atom model. Moreover, from the much larger anisotropic mean-square displacements of ammonium protons the NH(4)(+) groups were refined with a reasonable split-atom model, and their motional behaviour was also analysed by rigid-body treatment. Finally, careful consideration was given to show possible supplementary proton migration between the ammonium protons and those of the hydrogen bonds in this high-temperature phase.
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