Electrical conductivity of LSGM-YSZ composite materials synthesized via coprecipitation route

Raghvendra; Singh, Rajesh; Singh, Prabhakar
August 2014
Journal of Materials Science;Aug2014, Vol. 49 Issue 16, p5571
Academic Journal
Composites of Strontium- and Magnesium-doped lanthanum gallate, LaSrGaMgO (LSGM), and yttria-stabilized zirconia, ZrYO (YSZ), with weight ratios of 9.5:0.5, 9:1 and 8.5:1.5 were first prepared by co-precipitation route. The component compounds, LSGM and YSZ were also prepared by the same route for comparative study. X-ray Rietveld analyses revealed that the sintered LSGM-YSZ composites contain mainly perovskite orthorhombic LSGM phase along with fluorite YSZ phase similar to that of the cubic zirconia. Scanning Electron Microscopic image of the composite depicted the spherical- and oval-shaped grains. XPS spectra of the composite exhibited the LSGM along with a trace amount of the YSZ constituents. Electrical conductivity of the three systems was measured in the frequency range 20 Hz-1 MHz and in the temperature range of 400-700 °C. LSGM-YSZ composite electrolyte with 9:1 ratio was found to exhibit enhanced electrical conductivity in comparison to LSGM and YSZ systems. Moreover, it exhibited lower activation energy than that of their individual components.


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