In Situ and Ex Situ Monitoring of Oxygen Absorption in YBaCo4O7+δ

Oxygen absorption in YBaC o4 O 7+δ was studied by in situ XRD and by XANES spectroscopy. Unit cell of 10.875 x 10.168 x 12.788 A 3 (Pnna) was found for the oxygenated phase. XANES shows that oxygen absorption increases the number of different crystallographic sites for Co.