Oxygen defects and structure

Structure of barium copper pyrosilicate at 300 K

“…The 'l-2-3'-type superconductors have the ability to interact with oxygen. This interaction is very important because superconducting properties depend on the oxygen stoichiometry (Pietraszko, BARIUM DICOPPER DISILICATE Welch, Emery & Cox, 1987). Heating of the '1-2-3' compounds results in reversible loss of oxygen, which indicates a high chemical activity.…”