Synthesis of a Sr-doped HgBa2Ca0.86Sr0.14Cu2O6+δ superconductor using ternary oxide precursors

Nam H. Hur, Nae H. Kim, Sang H. Kim, Yong K. Park, Jong C. Park

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Polycrystalline samples of a Sr-doped HgBa2Ca0.86Sr0.14Cu2O6+δ (denoted as Hg-1212) were prepared by solid state reaction of stoichiometric mixtures of HgO, Ba2CuO3+y and Ca0.86Sr0.14CuO2. The superconducting transition temperature (Tc) of the as-synthesized Hg-1212 is about 120 K. Upon annealing as-synthesized Hg-1212 samples under an oxygen atmosphere, the Tc increased to 124 K. Rietveld profile analysis of X-ray powder diffraction data revealed that the Hg-1212 is isostructural with TlBa2CaCu2O7-δ; space group P4/mmm, a=3.8584(1) A ̊ and c=12.6646(5) A ̊. The use of ternary oxides as precursors appeared to facilitate the nucleation of the Hg-1212 phase. Using this precursor method, a nearly single-phasic sample of Hg-Ba2Ca0.86Sr0.14Cu2O6+δ was reproducibly obtained.

Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number3-4
StatePublished - 1994 Oct 1

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