Abstract
Synthesis and processing of bulk (Hg,Pb)Ba 2Ca 2Cu 3O y (HgPb1223) superconductor using commercial BaCaCuO precursor powders is reported. HgPb1223 is shown to form over a wide range of temperatures, 750–880°C. The microstructure and intergrain connectivity of samples depends strongly on heat treatment and Hg-pressure during synthesis. Use of an external Hg-source during the reaction improves the density of the HgPb1223 products. The chemical nature of the external Hg-source changes the Hg-pressure and influences melting characteristics and grain growth. CaHgO 2 is shown to be a particularly effective external Hg-source for producing dense HgPb1223 materials with improved grain growth and texture. Microstructure of HgPb1223 synthesized using CaHgO 2 as the external Hg-source is characterized by large colonies of well-aligned superconducting grains. As-synthesized HgPb1223 samples were superconducting with T c values in the range 132–134 K without post annealing in oxygen or argon. Phase purity and microstructural characteristics are correlated with magnetization measurements.
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