Solid State Chemistry of High T sub c Superconductors
09 November 1987
Superconductivity onsets in excess of 90K have been found in Ba sub 2 YCu sub 3 O sub 7 and a number of related cuprate perovskites. Much work has concerned substitutional chemistry of sintered polycrystalline samples with a two to one ratio of divalent to trivalent ions on the A site of the perovskite structure.