Dynamical behavior of SeO4 tetrahedra in protonic conductor K3H(SeO4)2

Fumihito Shikanai, Keisuke Tomiyasu, Naofumi Aso, Susumu Ikeda, Takashi Kamiyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Neutron powder diffraction and inelastic neutron scattering experiments were performed to clarify the mechanism of phase transition and protonic conductivity of K3H(SeO4)2. A rotational SeO4 tetrahedra mode at the zone boundary L -point accounts for the symmetrical change in space group from R 3̄ m to C2/c. No significantly anomaly was observed in the transversal acoustic and under-damped optical modes, while a broad spectrum was observed around 0 meV at the L -point above T C. The spectrum depends on the temperature and the dependence is represented by the soft mode due to an over-damped phonon both Q and energy space. The rotational mode of tetrahedra drives the improper ferroelastic phase transition.

Original languageEnglish
Article number144103
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 2009 Oct 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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