Abstract

Hg-based (Hg,M)-1222 cuprates (Hg 0.75M 0.25)Sr 2(Gd 1.5Ce 0.5)Cu 2O z (M=W, Mo, V, Cr, Ti) have been synthesized using the precursor Sr 2(Gd 1.5Ce 0.5)Cu 2O z prepared by solid state reaction and citrate sol–gel process, respectively. X-ray powder diffraction indicates that the samples prepared by sol–gel process have better crystallization comparing with the solid state reaction. The citrate sol–gel process was improved by using diffluent Ce(NO 3) 3 to replace CeO 2 which is almost insoluble in nitric acid and pure (Hg,M)-1222 phase was obtained. Superconductivity was observed in the (Hg 0.75M 0.25)Sr 2(Gd 1.5Ce 0.5)Cu 2O z phase with M=W, Mo. Annealing under high oxygen pressure has apparently decreased the resistivity and improved T c for (Hg,M)-1222 (M=W, Mo) samples.

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