Direct measurement of the Cu oxidation number of cuprate superconductor ceramics

Oxygen determination from cell dimensions in YBCO superconductors

“…For YBa 2 Cu 3 O 7Àd (YBCO) [5][6][7], in which only copper has a variable oxidation state, the relation between oxygen content and cell dimensions or annealing temperature has been pointed out in many works [1,[8][9][10][11][12][13][14].…”