Publication
Materials Letters
Paper

Bismuth strontium calcium copper oxide high-Tc superconducting films from nitrate precursors

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Abstract

Superconducting films of bismuth strontium calcium cuprate were prepared by spray pyrolysis of mixed nitrate solutions onto heated (100) orientated MgO substrates, as well as yttria-stabilized zirconia and SrTiO3. Various compositions and annealing temperatures were explored. Best results -Tc = 82 K, TR=0=77 K, Jc (60 K) = 800 A/cm2-were obtained on MgO for a Bi2.15Sr1.68Ca1.17Cu2Ox composition after brief annealing in air just below its melting point. A mixture of phases with c-axis normal to the substrate is obtained; the "Bi2Sr2CaCu2O8+x" phase predominates in the best samples, while a phase with c0=24.4 A ̊ (or 48.8 Å) is always present. The superconductivity of the films is not significantly degraded by a 3 day immersion in water. © 1988.

Date

01 Jan 1988

Publication

Materials Letters

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