Frequency dependence of ionic conductivity and dielectric relaxation studies in Na3H(SO4)2 single crystal

R. H. Chen, C. S. Shern, T. Fukami

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Abstract

Electrical impedance measurements of Na3H(SO4)2 were performed as a function of both temperature and frequency. The electrical conductivity and dielectric relaxation have been evaluated. The temperature dependence of electrical conductivity reveals that the sample crystals transformed to the fast ionic state in the high temperature phase. The dynamical disordering of hydrogen and sodium atoms and the orientation of SO4 tetrahedra results in fast ionic conductivity. In addition to the proton conduction, the possibility of a Na+ contribution to the conductivity in the high temperature phase is proposed. The frequency dependence of AC conductivity is proportional to ωs. The value of the exponent, s, lies between 0.85 and 0.46 in the room temperature phase, whereas it remains almost constant, 0.6, in the high-temperature phase. The dielectric dispersion is examined using the modulus formalism. An Arrhenius-type behavior is observed when the crystal undergoes the structural phase transition.

Original languageEnglish
Pages (from-to)203-212
Number of pages10
JournalJournal of Physics and Chemistry of Solids
Volume63
Issue number2
DOIs
Publication statusPublished - 2002 Feb 1

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Keywords

  • A. Inorganic compounds
  • D. Dielectric properties
  • D. Electrical conductivity
  • D. Phase transitions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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