Nitrate and carbonate methods for the synthesis of superconducting lead strontium calcium yttrium copper oxides (Pb2Sr2Ca0.5Y0.5Cu3O8+.delta. and Pb0.5Sr2.5Ca0.5Y0.5Cu2O7-.delta.)
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We have attempted to prepare the two new superconducting oxides, Pb2Sr2Ca0.5Yq.5Cu3O8+δ and Pb0.5Sr2.5Ca0.5Cu2O7+δ, by heating the coprecipitated carbonates and by nitrate decomposition methods. The oxides so prepared show an onset of superconductivity ~74 and ~100 K, respectively. The minor phases occurring along with the superconducting ones were identified except for one X-ray reflection at 20 = 17.72°. The dependence of phases formed upon the particular preparative conditions is also discussed. © 1991, American Chemical Society. All rights reserved.
author list (cited authors)
Ram, R., & Clearfield, A.