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Ca-substituted, A-site deficient perovskite La0.2Sr0.7TiO3 as a potential anode material for SOFCs

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DOI

Author(s)

Ahmed D. Aljaberi, John T. S. Irvine

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Abstract

Samples from across the solid solution series La0.2Sr0.7-xCaxTiO3, were successfully synthesised by solid state reaction. Structural properties were determined at room temperature using X-ray powder diffraction and conductivity measurements were performed using the four probe DC and van der Pauw techniques at different temperatures and atmospheres. On increasing x, the perovskite phase lattice symmetry changes from cubic Pm (3) over barm to tetragonal I4/mcm at x = 0.05 and tetragonal to orthorhombic Pbnm at x = 0.425. The lattice also shrinks as x increases. Samples showed only a slight 0.3% increase in lattice volume after reduction at 900 degrees C in 5% H-2. On increasing calcium doping, conductivity in reduced samples and equilibrated at 900 degrees C in 5%H-2 increased markedly reaching 27.53 S cm(-1) at x = 0.45, but decreased as x increased further.

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Details

Original languageEnglish
Pages (from-to)5868-5874
Number of pages7
JournalJournal of Materials Chemistry A
Volume1
Issue number19
Early online date20 Mar 2013
DOIs
Publication statusPublished - 21 May 2013

    Research areas

  • CONDUCTIVITY, DOPED STRONTIUM-TITANATE, RAMAN, CATIO3, HIGH-TEMPERATURE, SYSTEM, PHASE-TRANSITIONS, OXIDE FUEL-CELLS, SRTIO3, ELECTRICAL-PROPERTIES

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