Yttrium barium copper oxide (1/2/3/6.9)

Ba₂Cu₃O_6.877Y

Sullivan, J DBordet, PMarezio, MTakenaka, KUchida, S

Physical Review, Serie 3. B - Condensed Matter (18,1978-) (1993) 48, 14 10638-10641

a=3.8184(3)Å   b=3.8857(2)Å   c=11.701(1)Å

α=90°   β=90°   γ=90°