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期刊论文
High-pressure synthesis of single-phase superconductors Hgz Srx Baz_x Caz Cu3 08+& and (Hg, M)Srz Caz Cu3 Oy with M=Pb and Mo
Physica C 241 (1995) 211-218，-0001，（）：
The recent observation of superconductivity above 160 K under high pressures has prompted us to investigate the possibility of retaining such high-temperature superconductivity at ambient pressure by substituting Sr for Ba in Hg Ba2 Caz Cu3 08 (Hg-1223). High-purity (≥ 90%) Hg-1223 phase samples were synthesized with a nominal composition of Hgz Srx Ba2_x Caz Cu3 O8+& (where z=0.75 and x=0.0.5 or 1). By adding a second element, Pb or Mo, supposedly to the Hg site, (Hg, Pb/Mo)Sr2 Caz Cu3 O8+& with purity up to 90% was achieved. Unfortunately, Tc decreases with Sr substitution. The roles of Sr in the phase stability, and the synthesis conditions of the Sr based Hg-1223, and the Sr substitution effect on the Tc of these samples will be discussed.
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