Further Increase of T (c) in Y-Ba-Cu-O Superconductors

This paper presents the synthesis and characterization of three new Y-based high temperature-superconducting compounds having relatively higher transition temperature T (c) compared with that of the Y-123, Y-124, and Y-247. The electrical resistivity measurements indicate the onset critical temperatures as high as 98 K. Atomic compositions of these new Y-Ba-Cu-O superconductors are Y(2)Ba(3)Cu(5.2)O (x) , Y(2)Ba(5)Cu(9)O (x) , and YBa(4)Cu(5)O (x) . The X-ray analysis has shown that they have a similar crystalline structure as Y-123 phases.