High-temperature electrical conductivity of GdxTiyZrzCe1–x–y–zO2 solid solutions

The influence of the composition of the initial nanocrystalline powders of Gd x Ti y Zr z Ce 1– x – y – z O 2 ( x + y + z ≤ 0.3) on electrical conductivity of ceramics, sintered at 1300°С in air, was investigated. The phase composition and microstructure of the samples were studied by XRD and SEM, respectively. The electrical conductivity of these materials was measured by four-probe DC technique and AC impedance spectroscopy in the temperature range of 400–1000°С in air. It was shown that the optimal composition of initial precursors was Gd 0.1 Zr 0.05 Ti 0.05 Ce 0.8 O 2 , which can be used as a solid electrolyte for intermediate-temperature solid oxide fuel cells.