Abstract
Sr-bearing Hg-based cuprates (Hg1-yTiy)Sr-2(Ca1-xYx)Cu2Oz with Ti on the Hg site have been successfully prepared. X-ray Rietveld refinement of the structure for the O-2-annealed sample with nominal composition of y = 0.25 and x = 0.50 is carried out based on tetragonal space group P4/mmm. The refined chemical composition is (Hg0.59Ti0.41)Sr-2(Ca0.32Y0.68)Cu2O6.66. Superconducting properties of the as-prepared samples have been improved after O-2 annealing, the highest onset T-c of 100 K is obtained in the O-2-annealed sample with y = 0.25 and x = 0.35. (C) 1997 Published by Elsevier Science B.V.