Conductivity of strontium- and lithium-doped-lanthanum orthogallate (La0.9Sr0.1Ga1-yLiyO3- δ; y = 0.05 and 0.10) synthesized via metal nitrate-glycine gel route

Abdul Majeed Azad*, Muralidharan Ramachandran, Neil Schweitzer

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Strontium- and magnesium-doped-lanthanum orthogallate have emerged as promising alternative solid electrolytes for solid-oxide fuel cells in the intermediate-temperature regime. In accordance with the theoretical consideration, doping by a monovalent ion at the B-site is envisaged to increase the defect concentration and enhance the oxide ion conductivity. With this aim, strontium- and lithium-doped-lanthanum orthogallate formulations (La0.9Sr0.1Ga1-yLiyO3- δ; y = 0.05 and 0.10) were synthesized via soft-chemistry route of metal nitrate-glycine combustion. Systematic phase and microstructural evolution as a function of processing temperature was followed by X-ray diffraction and scanning electron microscopy of the calcined and sintered samples. Electrical characterization on the sintered sample by the 4-point DC and AC impedance measurements in the temperature range of 550-850 °C showed that Li-doping at B-site in LaGaO3 yielded conductivity higher than that of yttria-stabilized zirconia, but somewhat inferior to the Mg-doped analogs.

Original languageEnglish (US)
Pages (from-to)1476-1486
Number of pages11
JournalSolid State Ionics
Volume178
Issue number25-26
DOIs
StatePublished - Oct 1 2007

Keywords

  • Doped-lanthanum orthogallate
  • Electrical conductivity
  • Electron microscopy
  • Soft-chemistry synthesis
  • Solid-oxide fuel cells
  • X-ray diffraction

ASJC Scopus subject areas

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

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