Determination of oxygen permeation kinetics in a ceramic membrane with the composition SrFeCo_(0.5)O_(3.25- delta )

摘要

The oxygen permeation through an oxide membrane with bulk composition SrFeCo_(0.5)O_(3.25- delta ) has been measured as a function of both oxygen partial pressure and temperature. The results of the pressure dependence of the permeation indicate that the oxygen transport in this membrane is dependent primarily on the bulk diffusion rate. Although the permeation experiments were carried out at temperatures within, or very close to, the range where SrFeCo_(0.5)O_(3.25- delta ) (x chemical bounds approx 0.42) together with fractions of Sr(Co, Fe)O_(3- delta ) perovskite and Co-Fe oxide that formed as stable phases during densification of the membrane at high temperature (1090 deg C). These additional phases persisted in the mebrane during the permeation measurements.