STRUCTURAL ORDERING AND CHEMICAL-STABILITY OF A COMPLEX PEROVSKITE OXIDE DYBA2ZRO5.5 WITH YBA2CU3O7-DELTA SUPERCONDUCTORS

A complex perovskite oxide DyBa2ZrO5.5 has been synthesized by solid-s tate reaction. Structural ordering in this material has been studied b y X-ray diffraction (XRD). The XRD spectra reveal that DyBa2ZrO5.5 has an ordered complex cubic perovskite structure. The presence of super structure reflections in the XRD spectra is characteristic of A(2)BB'O -6-type crystalline structure. The chemical stability of DyBa2ZrO5.5 w ith YBa2CuO7-delta (YBCO) superconductors has been studied by XRD and electrical resistivity measurements. These studies show that DyBa2ZrO5 .5 is chemically stable with YBCO and there is no degradation in the s uper conducting transition temperature T-c of YBCO even when mixed up to 1:1 vol%, with DyBa2ZrO5.5 in YBCO. Detailed study of the supercond ucting transition region shows that T-c(onset) and T-c(0) values of pu re YBCO and YBCO-DyBa2ZrO5.5 composites are similar in both cases. The implications are discussed.