Cer.a based electr.lyte mater.als ar. ver. useful in inter.ediate-temper.tur. solid oxide fuel cell (IT-SOFC). The compositions Ce0.85Gd0.15 - xCaxO2 - δ (x = 0.0 - 0.075) wer. pr.par.d thr.ugh sol-gel method. Their.str.ctur. was studied by X-r.y diffr.ction. Dense cer.mic Ce0.85Gd0.15 - xCaxO2 - δ samples wer. pr.par.d by sinter.ng the pellets at 1300°C. The lattice par.meter.was calculated by r.etveld r.finement of Xr. patter.s. Four.pr.be A.C. impedance spectr.scopy was used to study the total ionic conductivity of doped and co-doped cer.a cer.mics in the temper.tur. r.nge 200°C - 700°C. The Ce0.85Gd0.15 -xCaxO2 -δ composition showed maximum ionic conductivity with less activation ener.y.
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