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 HgBa2Ca2Cu3O8 (Hg-1223). High-purity (≥90%) Hg-1223 phase samples were synthesized with a nominal composition of HgzSrxBa2-xCa2Cu3 O8+δ (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)Sr2Ca2Cu2 O8+δ 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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