Effect of Cobalt Co-Doping on Ionic Conductivity of Coy Gdx-Y Ce1-X O2-δ and CoyNd X-Y Ce 1-XO 2-δ (y = 0.05 and 0.1 mol%) Nanocomposites Synthesized by EDTA-Glycol Method. Int. J. Environ. Sci. 2025, 3934-3942. https://doi.org/10.64252/agxcwd63.