The interaction between Ce0.90Gd0.10O1.95 and Y0.16Zr0.84O1.92 and the electrical conductivity and thermal expansion for solid solutions of Ce0.90Gd0.10O1.95 and Y0.16Zr0.84O1.92 were studied. Thin films of Ce0.90Gd0.10O1.95 interacted with Y0.16Zr0.84O1.92 substrates around 1000C, with diffusion of Zr into Ce0.90Gd0.10O1.95. The reaction between Ce0.90Gd0.10O1.95 and Y0.16Zr0.84O1.92 powder started around 1200C. The diffusion of Ce into Y0.16Zr0.84O1.92 was the main reaction. The solid solutions of (Ce0.90Gd0.10O1.95)x– (Y0.16Zr0.84O1.92)1−x were single phase and possessed a lower conductivity than that of either Ce0.90Gd0.10O1.95 or Y0.16Zr0.84O1.92. The electrical conductivity for the solid solutions increased with decreasing O activity, whereas the PO2 independent ionic conductivity region was not observed. The dimensional expansion due to reduction (chemical expansion) was larger for the solid solutions compared to that for of Ce0.90Gd0.10O1.95 and Y0.16Zr0.84O1.92.

Electrical Conductivity and Stability of Gd-Doped Ceria/Y-Doped Zirconia Ceramics and Thin Films. X.D.Zhou, B.Scarfino, H.U.Anderson: Solid State Ionics, 2004, 175[1-4], 19-22