High-Pressure Structural Studies of Hydroxides.

  • Loveday J. S.
    Department of Physics and Astronomy, The University of Edinburgh
  • Marshall W. G.
    Department of Physics and Astronomy, The University of Edinburgh
  • Nelmes R. J.
    Department of Physics and Astronomy, The University of Edinburgh
  • Besson J. M.
    Physique des Milieux Condensés Université P. et M. Curie
  • Klotz S.
    Physique des Milieux Condensés Université P. et M. Curie
  • Hamel G.
    Département des Hautes Pressions, Université P. et M. Curie

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  • High-Pressure Structural Studies of Hyd

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Abstract

Hydrogen bonds involving hydroxyl groups appear to to be significantly different from the H-bonds found in molecular solids. High-pressure structural studies of hydroxides using neutron diffraction provide a means to explore the changes in geometry over a wide range of interatomic separations. The structure of NaOD-V is found to have a complex geometry which appears on the basis of bond-valence-sum calculations to be at most weakly H-bonded. KOD-VI is found not to be structurally related to NaOD-V as previously thought. Studies of ammonia monohydrate have provided the first full determination of the ambient pressure structure and have revealed phase transitions under pressure.

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