Studies on structural, morphological and electrical properties of Ce1-xGdxO2-(x/2)

M. G. Chourashiya, J. Y. Patil, S. H. Pawar, L. D. Jadhav*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The gadolinium-doped ceria (GDC) is considered as one of the most promising electrolytes for intermediate temperature solid oxide fuel cells (IT-SOFCs). Since the operating temperature of SOFC mainly depends on properties of electrolytes, the structural, morphological and electrical properties of GDC are studied as a function of concentration of 'Gd' and sintering temperature. The lattice parameter, density, surface morphology and conductivity of GDC samples are improved upon sintering. Further an increase in lattice parameter with concentration of Gd confirms the dissolution of Gd2O3 in CeO2. The crystallite size and grain size was observed to decrease with "Gd" concentration. All GDC samples sintered at 1773 K showed uniform and smoother surfaces with conductivity ∼0.1 S cm-1 at 1023 K and activation energies less than 0.9 eV. An impedance study confirms the formation of well-grown grains at higher sintering temperature.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalMaterials Chemistry and Physics
Volume109
Issue number1
DOIs
StatePublished - 15 May 2008
Externally publishedYes

Keywords

  • Electrical conductivity
  • Electron microscopy
  • Oxides
  • Sintering

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