The permeation of O through dense ceramic membranes of the cubic perovskite solid solution, SrCo0.85Ti0.15O3, was studied using membrane feed-side O partial pressures of 0.21 to 100atm, at 850 to 1040K (figure 4). The dependence of the O flux upon membrane thickness suggested that bulk ionic conductivity was the permeation-determining factor at high (above 1atm) O partial pressures. Increasing the O pressure to 80 to 100atm was found to result in a sharp increase in the permeation flux, accompanied by a partial decomposition of the cubic perovskite phase to form 2 iso-structural perovskite-type phases. No phase changes were observed when testing under O pressures of 1 to 60atm.

Ionic Transport in Sr(Co,Ti)O3 Ceramics at High Oxygen Pressures. V.V.Kharton, A.P.Viskup, A.A.Yaremchenko, P.F.Kerko, E.N.Naumovich, A.V.Kovalevsky: Materials Research Bulletin, 1999, 34[12-13], 1921-8

Figure 4

Permeation of O in Sr(Co,Ti)O3