Hydrogen Rearrangements in CsHSeO<SUB>4</SUB> Accompanied with both the Phase Transition and Domain-Boundary-Movement

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  • Komukae Masaru
    Department of Applied Physics, Faculty of Science, Science University of Tokyo
  • Tanaka Minoru
    Department of Applied Physics, Faculty of Science, Science University of Tokyo
  • Osaka Toshio
    Department of Applied Physics, Faculty of Science, Science University of Tokyo
  • Makita Yasuharu
    Department of Applied Physics, Faculty of Science, Science University of Tokyo
  • Kozawa Kozo
    Department of Industrial and Engineering Chemistry, Faculty of Science and Technology, Science University of Tokyo
  • Uchida Tokiko
    Department of Industrial and Engineering Chemistry, Faculty of Science and Technology, Science University of Tokyo

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  • Hydrogen Rearrangements in CsHSeO4 Accompanied with both the Phase Transition and Domain-Boundary-Movement
  • Hydrogen Rearrangements in CsHSeO4 Acco

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Abstract

Hydrogen rearrangements accompanied with the movement of domain boundaries in CsHSeO4 below the ferroelastic phase transition temperature (Tc=128°C) and possible motional states of hydrogens above Tc were studied based on the crystal structure obtained in the X-ray re-examination at room temperature and twinning conditions for ferroelastic domains observed below Tc. The crystal was confirmed to be monoclinic with the space group P21⁄c and to have a superlattice structure below Tc, while it is tetragonal with the space group I41⁄amd above Tc. It was deduced by taking account of symmetry change from P21⁄c to I41⁄amd and twinning conditions that the hydrogen bonds in CsHSeO4 above Tc are broken instantaneously and the hydrogens are hopping among the 16-fold (f) equivalent positions, leading to so called three-dimensional superionic conductivity of hydrogens above Tc.

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