Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

S. A. Sunshine, L. F. Schneemeyer, T. Siegrist, D. C. Douglass, J. V. Waszczak, R. J. Cava, E. M. Gyorgy, D. W. Murphy

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We report the synthesis and characterization of Sr2YCu3-xMxOy, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba2YCu3O7. While phase-pure Sr2YCu3O7 cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr2YCu3-xMxO7+δ, samples with M = Al or Co have δ = 0 for all x and δ > 0 when M = Fe and x ≈ 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state 27Al NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.

Original languageEnglish
Pages (from-to)331-335
Number of pages5
JournalChemistry of Materials
Issue number3
StatePublished - 1 May 1989


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