Neutron powder diffraction study of (Bi0.35Cu0.65)YSr2Cu2O7

Abstract

The recently reported (Bi/Cu)Sr₂YCu₂O₇ has been studied by time-of-flight powder neutron diffraction. The proposed 1212 structure has been confirmed and refinements have shown the oxygen in the (Bi/Cu)O layer is displaced by 0.78 Å from the ideal (1/2, 1/2, 0) site (P4/mmm space group) along {100}. Bond valence sum calculations have suggested oxidation states of Bi⁵⁺ and Cu²⁺ for the cations in the (Bi/Cu)O layers.