Abstract
New mercury-based. superconductors, Hgl−xTlxBa2(Ca0.86Sr 0.14)2Cu3O 8+δ (x=0.25, 0.50, 0.75; denoted as Hg,Tl-1223), were prepared by solid state reactions of HgO, Tl2O3, Ba2CuO3+x, and Ca0.86Sr 0.14CuO2. X-ray powder diffraction data and EPMA results revealed that the Hg, Tl-1223 compounds form complete solid solution. All the diffraction lines are well indexed on the tetragonal ‘1223’ (space group: P4/mmm) structure. The superconducting transition temperatures for the as-synthesized samples are about 128 K. After annealing the samples in an argon atmosphere at 400 °C for 10 h, the superconducting transition temperatures have been found to increase to 132 K. In contrast to other mercury-based superconductors, the Hg, Tl-1223 compounds are quite stable even at 500 °C. The critical current densities of the Hg, Tl-1223 largely enhance as the thallium concentration increases.
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