Mixed Conduction and Oxygen Permeation of ZrO2-Tb2O3.5-Y2O3 Solid Solutions

(ZrO₂)_1-x-y (Tb₂O_3.5)_x (Y₂O₃)_y solid solutions with a fluorite-type structure, where https://www.w3.org/1998/Math/MathML"> x = 0.3 − 0.5 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003421290/07e4de97-c68f-4ca1-95b4-28d8b410031d/content/eq532.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> and https://www.w3.org/1998/Math/MathML"> y = 0 − 0.1 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003421290/07e4de97-c68f-4ca1-95b4-28d8b410031d/content/eq533.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> , were prepared using citrate synthesis. The solid solutions are mixed oxygen ion and electronic conducting materials. The total electrical conductivity reaches 3.8 S/m and the oxygen permeation is about 2.6 × 10⁻⁷ mol/m².s, at 1173 K. The influence on the electrical conductivity and oxygen permeation of the valence change of Tb³⁺/⁴⁺ ions and of the addition of yttria to the solid solutions is discussed.