Synthesis of Hg-based superconductors by hot-isostatic pressing

G. C. Celotti, A. Tampieri, C. Micheletti, D. Dalle Fabbriche

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The preparation of H(Pb)BCCO (1201) and (1223) phases was performed by hot-isostatic-pressing (HIP) using simple oxides as precursors canned in silver tube. In the case of Hg0.8Pb0.2Ba2CuO4+δ the preparation, carried out at 800°C and 0.15 GPa for 5 hrs, yielded a single phase bulk sample. On the other hand the preparation of Hg0.8Pb0.2Ba2Ca2Cu3O 8+δ at 820°C and 0.15 GPa for 5 hrs allowed the attainment of a high volume fraction of 1223 phase. Megnetic susceptibility of 1201 phases showed a granular transition around 90 K; in the case of 1223 the value was around ≈ 128 K followed by a broadened intergranular transition. These results show the feasibility of 1201 preparation with high purity and in form of bulk samples and of 1223 synthesis in large quantities, almost impossible to obtain with conventional techniques.

Original languageEnglish (US)
Pages (from-to)1243-1246
Number of pages4
JournalKey Engineering Materials
Issue number136 PART 2
StatePublished - 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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