A new Cu-free cubic phase as competitor in the synthesis of Hg(Re)-1223 superconductor (Articolo in rivista)

Type
Label
  • A new Cu-free cubic phase as competitor in the synthesis of Hg(Re)-1223 superconductor (Articolo in rivista) (literal)
Anno
  • 2000-01-01T00:00:00+01:00 (literal)
Alternative label
  • G. Celotti, A, Tampieri, F. Monteverde (2000)
    A new Cu-free cubic phase as competitor in the synthesis of Hg(Re)-1223 superconductor
    in Solid state communications (Print)
    (literal)
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  • G. Celotti, A, Tampieri, F. Monteverde (literal)
Pagina inizio
  • 109 (literal)
Pagina fine
  • 114 (literal)
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  • 116 (literal)
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  • 5 (literal)
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  • 2 (literal)
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  • ISTEC-CNR (literal)
Titolo
  • A new Cu-free cubic phase as competitor in the synthesis of Hg(Re)-1223 superconductor (literal)
Abstract
  • During the attempts to improve the sealed-quartz tube synthesis of Hg(Re)-1223 superconductor, a new compound was systematically identified under certain unsuccessful experimental conditions. It was characterized by a distinct powder diffraction pattern with cubic diamond-like extinctions and lattice parameter 8.48-8.53 A?, according to thermal treatment length. A comparison with other cubic phases, uncommon in superconducting systems, and in particular Ba4CaCu3O8.25, together with electron microprobe analysis, allowed us to determine a composition Hg2Re0.5Ba4Ca1.5O8.5 and supplied a reliable model for its structure. However, the peculiarity of the observed pattern, among the apparently manifold possible answers, led to an univocal interpretation in terms of the high-symmetry space group Fm3m(225), with Z ˆ 2; r ˆ 6:70 g=cm3; the reliability factor was 5.0%. Indeed this phase, singularly Cu-free and clearly not superconductive, much more than a precursor can be considered an unwanted accident in Hg(Re)-1223 preparation route: its existence was confirmed by a successful synthesis starting from the above reported stoichiometry (literal)
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