Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites Via Chemical Substitution
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.
MSU Digital Commons Citation
Sunshine, Steven A.; Schneemeyer, Lynn; Siegrist, Theo; Douglass, Dean C.; Waszczak, Joseph V.; Cava, Robert J.; Gyorgy, E.Michael; and Murphy, Donald W., "Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites Via Chemical Substitution" (1989). Department of Chemistry and Biochemistry Faculty Scholarship and Creative Works. 522.