Electrical Properties of Co-Doped Ceria Electrolyte Ce0.8-xGd0.2SrxO2-δ (0.0 ≤ x ≤ 0.1)
S. Ramesh and C. Vishnuvardhan Reddy
Department of Physics, University College of Science, Osmania University, Hyderabad, 500 007 India
Received: January 30, 2009; In final form: March 30, 2009
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Effects of strontium doping on electrical properties of gadolinium doped ceria were investigated. The Ce0.8-xGd0.2SrxO2-δ (0.0 ≤ x ≤ 0.1) compositions were prepared by sol gel method and sintered at 1300°C for 8 h, the bulk densities were over 93% of theoretical density. These results were consistent with scanning electron microscope. The crystallite size of these materials was determined using the X-ray powder diffractometer and the sizes range from 19.4 nm to 24.4 nm. From the experimental results, it was observed that the composition Ce0.8-xGd0.2SrxO2-δ (x=0.02) exhibits higher conductivity (23.6 × 10-3 S cm-1) and minimum activation energy (0.83 eV) at 700°C. This composition is thus a potential candidate for use as electrolyte applications in intermediate temperature solid oxide fuel cells.
DOI: 10.12693/APhysPolA.115.909
PACS numbers: 65.40.De, 66.10.Ed, 81.20.Fw, 82.45.Gj, 82.47.Ed, 82.45.Xy