Ionic conductivity and dielectric relaxation studies of LiNaSO4 single crystal

R. H. Chen, Chaw Ming Tseng, C. S. Shern, T. Fukami

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thermal analysis for LiNaSO4 single crystals by differential scanning calorimetry (DSC) had shown a clear endothermic peak at 796.9 K. The enthalpy energy of the structural phase transition, ΔH=11.94 kJ/mol, was measured. The corresponding entropy change, ΔS was 14.98 J/K mol. The dielectric response of LiNaSO4 single crystal under ac electric field was investigated by impedance spectroscopy. Two distinct relaxations in the sample crystal were detected: dielectric dipolar relaxation and ionic conductivity relaxation. The dipolar relaxation peak due to SO- 4 reorientation was found at around 1.5 × 105 Hz, which is temperature independent. The ionic conductivity relaxation due to Li+ was found at the lower frequency and it was temperature dependent. The dc conductivity varied from 6.7×10-8 Ω-1 cm-1 at 423 K to 1.0×10-4 Ω -1 cm-1 at the temperatures above 793 K. The activation enthalpy of Li++ is 1.63 eV in the temperature range between 593 and 793 K. The sample crystal became a fast ionic conductor in the high-temperature phase with the activation energy of 0.08 eV. The ionic conductivity and dipolar relaxations are synchronized in the high-temperature phase of the sample crystal.

Original languageEnglish
Pages (from-to)877-882
Number of pages6
JournalSolid State Ionics
Volume181
Issue number19-20
DOIs
Publication statusPublished - 2010 Jul 16

Fingerprint

Dielectric relaxation
Ionic conductivity
ion currents
Single crystals
single crystals
Temperature
Crystals
Enthalpy
enthalpy
crystals
conductivity
temperature
Thermoanalysis
retraining
Differential scanning calorimetry
thermal analysis
Entropy
heat measurement
conductors
Activation energy

Keywords

  • Dielectric properties
  • Differential scanning calorimetry
  • Impedance spectroscopy
  • Ionic conductivity

ASJC Scopus subject areas

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

Cite this

Ionic conductivity and dielectric relaxation studies of LiNaSO4 single crystal. / Chen, R. H.; Tseng, Chaw Ming; Shern, C. S.; Fukami, T.

In: Solid State Ionics, Vol. 181, No. 19-20, 16.07.2010, p. 877-882.

Research output: Contribution to journalArticle

Chen, R. H. ; Tseng, Chaw Ming ; Shern, C. S. ; Fukami, T. / Ionic conductivity and dielectric relaxation studies of LiNaSO4 single crystal. In: Solid State Ionics. 2010 ; Vol. 181, No. 19-20. pp. 877-882.
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