Synthesis, structure and superconducting properties of metastable Y(Ba/2- x/Y/x/)Cu3O(7+delta)

The synthesis and characterization of a majority (90-95 percent) phase Y1.5Ba1.5Cu3O(7+delta), referred to for historical reasons as Y 3-3-6, prepared by firing an atomically mixed citrate precursor between 810 and 825 C for 2 hrs, are reported. X-ray and powder diffraction data indicate that the Y...

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Veröffentlicht in:Nature (London) 1988-01, Vol.331, p.326-328
Hauptverfasser: Iqbal, Z, Reidinger, F, Bose, A, Cipollini, N, Taylor, T J
Format: Artikel
Sprache:eng
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Zusammenfassung:The synthesis and characterization of a majority (90-95 percent) phase Y1.5Ba1.5Cu3O(7+delta), referred to for historical reasons as Y 3-3-6, prepared by firing an atomically mixed citrate precursor between 810 and 825 C for 2 hrs, are reported. X-ray and powder diffraction data indicate that the Y 3-3-6 is isostructural with its La analog La1.5Ba1.5Cu3O(7+delta). Electron microprobe and thermogravimetry data yield a unit-cell composition Y(Ba/2-x/Y /x/)Cu3O(7+delta), with x = 0.50 and delta = 0.10-0.15 for the parent compound. Specimens of Y 3-3-6 with x = 0.50 and 0.375, which were annealed in O2 at 1 atm and at above 3 atm, displayed semiconducting behavior. Filamentary superconductivity, detected electrically and magnetically, with transition onsets at 80 and 60 K respectively, is observed in specimens annealed in 3 atm O2 at 520 C. (C.D.)
ISSN:0028-0836