A composite material composed of 60vol%Bi1.6Y0.4O3 and 40vol%Ag was directly fabricated by a citrate sol–gel method. Composite material constituting of metallic Ag and bismuth oxide phase with a high oxide ionic conductivity was formed by heating the precursor above 1073K. A well-sintered material was fabricated by using the precursor powder prepared via the sol–gel route. Oxygen permeation in the Bi1.6Y0.4O3–Ag composite was measured as a function of the partial pressure difference of O between the two sides of a membrane and temperature. The rate-determining step in O permeation was concluded to be oxide ion transport in the Bi1.6Y0.4O3 component of the composite.

Oxygen Permeation and Electrical Transport Properties of 60vol%Bi1.6Y0.4O3 and 40vol%Ag Composite Prepared by the Sol–Gel Method. K.Kobayashi, T.Tsunoda: Solid State Ionics, 2004, 175[1-4], 405-8