Oxygen Transport in the Sr_2Fe_(3-x)Co_xO_y System

摘要

The mixed-conducting Sr-Fe-Co oxide has potential use as a gas separation membrane. Its superior oxygen transport reveals the feasibility of using oxide membranes in large-scale oxygen separation. Sr_2Fe_(3-x)Co_xO_y samples were made by solid state reaction. To understand the oxygen transport mechanism in this system, conductivity and thermogravimetry experiments were conducted at high temperature in various oxygen partial pressure environments. The oxygen idffusion coefficient was determined from the tme realxation transient behavior of the specimen after switching the surrounding atmosphere. Mobility of the charge carrier was derived from relaative conductivity and weight changes. X-ray diffraction experiments were carried out on these sampels to determine their crystal structures.