Abstract
Structure and orientational disorder of ammonium ions in the high-temperature phase I of ND 4I were studied by reverse Monte Carlo and maximum entropy methods using powder neutron diffraction data. The ammonium ions were found to perform a librational motion with an average angular libration amplitude of γ=20° and reorientational motion by 39° jumps of the N–D bonds between ( x x x ) and ( x x z ) positions in the structure. Reorientations by 90° jumps were found to have a low probability.
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