Preparation of HgBaCaCuO Polycrystals and Silver Sheathed Tapes by a Two-Zone Technique
The HgBa2Can-1CunOx (n=1, 2, 3) superconductors exhibit excellent superconducting properties, especially above 77 K. The production of a technical HgBa2CanlCunOx conductor not only requires the synthesis of bulk material with large critical current density (i.e., strong flux pinning and minimal weak links), but also the ability to do so in a form that satisfies the engineering constraints of superconducting applications. Preliminary studies of HgBa2CuO4+x/Ag wires have demonstrated that silver is a chemically compatible sheath material. Also, the chemical stability issue has been resolved with the partial substitution of rhenium for mercury. Here we present the results of our study of the phase formation and chemical stability of Hg1-δReδBa2Ca2Cu3O8+x as well as the preliminary results of a HgBa2CuO4+x/Ag wire study, and thus indicate the technical potential of the Hg-based superconductors.
KeywordsZone Assembly High Critical Temperature Evacuate Quartz Tube Ceramic Core National High Magnetic Field Laboratory
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