• Phase evolution and conductivity study of doped gadolinium-based perovskite oxides

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    • Keywords


      Solid oxide fuel cell; oxide ion conductor; impedance spectroscopy; perovskite; citrate gel.

    • Abstract


      The phase evolution and electrical conductivity of strontium-doped gadolinium aluminate (GdAlO$_3$) based perovskite oxides were investigated. The strontium-doped compositions of GdAlO$_3$ were prepared through the citrate gelprocess. Analyses of the phases in the Gd$_{1–x}$Sr$_x$AlO$_{3–{\delta}}$ system were carried out using X-ray diffraction. The morphology of the calcined powders was studied through scanning electron microscopy. The strontium-doped GdAlO$_3$ powdersobtained after calcination at 1000°C was found to be porous agglomerate composed of nanocrystalline grains. The electrical conductivity of Gd$_{1–x}$Sr$_x$AlO$_{3–{\delta}}$ (x = 0.02–0.14) was measured using ac impedance spectroscopy as a function of temperature ranging from 300 to 1000°C under air. The solid solubility of strontium in GdAlO$_3$ was found to be around 8 mol%. The undissolved strontium precipitated in the form of SrGd$_2$Al$_2$O$_7$ phase. The total electrical conductivity of Srdoped GdAlO$_3$ increased with increasing amounts of strontium up to 6 mol% doping.

    • Author Affiliations



      1. Powder Metallurgy Division, Materials Group, Bhabha Atomic Research Centre, Navi Mumbai 400703, India
    • Dates

  • Bulletin of Materials Science | News

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