Citation: Bordet, P; Chaillout, C; Fournier, T; Marezio, M; Kaldis, E; Karpinski, J; Jilek, E (1993). Evidence by x-ray diffraction for two apical oxygen sites in a copper- deficient Y Ba2 Cu2.78 O7 crystal. Physical Review, Serie 3. B - Condensed Matter (18,1978-), 47, pp. 3465-3468.
Formula: Ba2 Cu2.78 O7 Y
Chemical name:Yttrium barium copper oxide (1/2/2.8/7)