Mixed Oxygen-Ion and Electronic Conduction in Pr-Al-Based Perovskite-Type Oxides and Their Oxygen Permeability

摘要

The preparation and oxygen permeability of Pr{sub}0.9Ca{sub}0.1Al{sub}(1-x) M{sub}XO{sub}3 system, where M = Co and Fe, have been investigated. For Pr{sub}0.9Ca{sub}0.1Al{sub}(1-x)Fe{sub}xO{sub}3 solid solution with an orthogonal structure, an oxygen flux density of 4.6×10{sup}(-6) mol·cm{sup}(-2)s{sup}(-1) was attained for x = 0.8 under a methane conversion test at 1000°C, as a result of the enhancement of p-rype conductivity by Fe-doping. For Pr{sub}0.9Ca{sub}0.1Al{sub}0.2Fe{sub}0.8O{sub}3, the surface exchange kinetics seemed to be involved in oxygen permeation process when the membrane thickness was less than 0.03 cm.