Dielectric and AC ionic conductivity investigations in K3H(SeO4)2 single crystal

R. H. Chen, R. Y. Chang, S. C. Shern

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88 Citations (Scopus)

Abstract

Optical observation under the polarizing microscope and DSC measurements on K3H(SeO4)2 single crystal have been carried out in the temperature range 25-200 °C. It reveals a high-temperature structural phase transition at around 110 °C. The crystal system transformed from monoclinic to trigonal. Electrical impedance measurements of K3H(SeO4)2 were performed as a function of both temperature and frequency. The electrical conduction and dielectric relaxation have been studied. The temperature dependence of electrical conductivity indicates that the sample crystal became a fast ionic conductor in the high-temperature phase. The frequency dependence of conductivity follows the Jonscher's universal dynamic law with the relation σ(ω) = σ(0) + Aωn, where ω is the frequency of the AC field, and n is the exponent. The obtained n values decrease from 1.2 to 0.1 from the room temperature phase to fast ionic phase. The high ionic conductivity in the high-temperature phase is explained by the dynamical disordering of protons between the neighboring SeO4 groups, which provide more vacant sites in the crystal.

Original languageEnglish
Pages (from-to)2069-2077
Number of pages9
JournalJournal of Physics and Chemistry of Solids
Volume63
Issue number11
DOIs
Publication statusPublished - 2002 Nov 1

Keywords

  • A. Inorganic compounds
  • C. Differential scanning calorimetry (DSC)
  • D. Dielectric properties

ASJC Scopus subject areas

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

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