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

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Abstract

Composites of Strontium- and Magnesium-doped lanthanum gallate, La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM), and yttria-stabilized zirconia, Zr0.9Y0.1O1.95 (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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Acknowledgements

We acknowledge DST-SERC for funding this work through its project sanction letter No. SR/FTP/ETA-0005/2010. We are thankful to Prof. ASK Sinha and Prof. O.P. Pandey for providing XPS and TEC measurement facility, respectively. Mr. Raghvendra is grateful to MHRD for providing teaching assistantship.

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  1. Department of Physics, Indian Institute of Technology (BHU), Varanasi, 221005, India

    Raghvendra, Rajesh Kumar Singh & Prabhakar Singh

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  1. Raghvendra
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  2. Rajesh Kumar Singh
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Correspondence to Prabhakar Singh.

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Raghvendra, Singh, R.K. & Singh, P. Electrical conductivity of LSGM–YSZ composite materials synthesized via coprecipitation route. J Mater Sci 49, 5571–5578 (2014). https://doi.org/10.1007/s10853-014-8265-5

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