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

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

Research output: Contribution to journalArticle

85 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

Fingerprint

Ionic conductivity
ion currents
alternating current
Single crystals
single crystals
crystals
impedance measurement
electrical impedance
Temperature
Crystals
conductors
microscopes
exponents
conduction
conductivity
temperature dependence
electrical resistivity
temperature
protons
room temperature

Keywords

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

ASJC Scopus subject areas

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

Cite this

Dielectric and AC ionic conductivity investigations in K3H(SeO4)2 single crystal. / Chen, R. H.; Chang, R. Y.; Shern, S. C.

In: Journal of Physics and Chemistry of Solids, Vol. 63, No. 11, 01.11.2002, p. 2069-2077.

Research output: Contribution to journalArticle

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N2 - 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.

AB - 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.

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