Determination of grain boundary conductivity using distribution function of relaxation times (DFRT) analysis at room temperature in 10 mol% Gd doped ceria: A non-classical electrostrictor

Tanmoy Paul, Nimrod Yavo, Igor Lubomirsky, Yoed Tsur

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The electrical conductivity of Ce0.90Gd0.10O1.95 oxide ion conductor is studied, emphasizing distribution function of relaxation times (DFRT) analysis of impedance spectroscopy measurements. The corresponding powder has been prepared by co-precipitation method and sintered at 1300 °C. The formation of the fluorite phase is confirmed by X-ray diffraction. The temperature dependence of ionic conductivity has been studied at different bias voltages. The impedance spectra are analysed by impedance spectroscopy genetic programming (ISGP) that finds an analytic form of the DFRT. Interestingly, both the grain and grain boundary conductivities can be identified at room temperature by analysing the DFRTs. At higher temperatures and higher bias voltages, the grain boundary diffusion process of oxygen ions is identified. Both the grain and grain boundary activation energies are bias independent.

Original languageEnglish
Pages (from-to)18-21
Number of pages4
JournalSolid State Ionics
Volume331
DOIs
Publication statusPublished - Mar 2019

Keywords

  • DFRT
  • Doped ceria
  • Grain boundary properties
  • Impedance spectroscopy

ASJC Scopus subject areas

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

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