Neutron Scattering Studies of the Ionic Conductor LiI D2O

N. H. Andersen, Jørgen Kjems, Finn Willy Poulsen

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    The structural properties of the ionic conductor LiID2O have been studied by neutron scattering. The cubic room temperature α-phase, Pm3m, is disordered both with respect to the occupation of the Li+-positions and to the orientations of the water molecules. A first order phase transition from the α-phase to a new orthorhombic β-phase, P21am or Pmam, has been found at - 54°C. The structural parameters of the β-phase have been determined by the Rietveld method based on powder diffraction data. The β-phase is found to have an antiferroelectric ordering of the water molecules and a spatial ordering of the Li+-sites. Evidence for short range order is found in the diffuse elastic scattering in the α-phase and the implications for the ionic conductivity are discussed.
    Original languageEnglish
    JournalPhysica Scripta. Topical Issues
    Issue number6
    Pages (from-to)780-784
    Publication statusPublished - 1982


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