Clarification of the oxygen adsorption properties of YBaCo4O7 at high temperature by thermogravimetry

The oxygen adsorption/desorption properties of YBaCo4O7 at high temperature were investigated by thermogravimetry (TG) method, in which two types of oxygen adsorption were combined. The first type adsorbed oxygen at about 700 °C and released the adsorbed oxygen at 880 °C. After the first type oxygen desorption, even the temperature and oxygen flow were kept the same, a second type oxygen adsorption at about 880 °C occurred and the adsorbed oxygen were released at above 980 °C. The combination of these two types of oxygen adsorption/desorption was responsible for the difference in TG curves obtained by different heating programs.